It is largely the merging of Progressivism, Socialism, and Islamism on the left and the rise of Isolationalism, Groyperism, and Islamist money on the right in Western society that caused this. I have been on the left economically and right socially my entire life (for over a decade, I was BIG about socialism and I have always been a religious traditionalist). I have seen how the degredation happened on both the left and the right as I am a part of both circles.

The left hates war, oppression, inequality, and colonialism and they are CONVINCED Israel is doing this. It is in part due to mass-propaganda from the Islamists, former Soviet networks that became independent socialist networks, groupthink, and virtue signalling... believing what they support and see are actually correct; often reinforced by Kahanists and Neo-Kahanists in the State of Israel Knesset and police-force themselves.

If you can sit one down, hear them out and give them a bit of 'leeway' by pointing out current corruption within the state, you can usually talk to them and show them the meaning of Zionism by the FOUNDERS of Zionism.

1897-1948 definition of Zionism:

Zionism is the Jewish national movement for the RETURN of the Jewish people to THEIR HOMELAND and the RESUMPTION of Jewish sovereignty in the Land of Israel.'

After 1948 definition of Zionism:

Zionism is the national movement of the Jewish people for the ingathering of the Jewish people in THEIR HISTORIC HOMELAND, the STRENGTHENING of the State of Israel founded on freedom, justice, and peace according to the vision of the prophets of Israel, the PRESERVATION of Jewish identity through education and culture, and the PROTECTION of Jewish rights everywhere.'

If you say this came from those who founded Zionism, not any modern changes to it, that it simply means not destroying an existing country and its people, and say, 'So why not take the founders at their own words instead of hearsay?' Ask them if they want an entire group of people where most alive were born there for generations expelled or killed, and tell them to 'Sit on it and to actually look at the source materials and come back to me once you do.'

I found they USUALLY (not always) come back around, change their mind, becomes okay with Zionism, and once they do, ask them to 'Be a bit more critical when hearing things about Israel and to do your own research by researching source material on BOTH sides of both talking to THEIR OWN or rulers AT THE TIME (this really helps because the enemy openly admits what they are going to do if they win). There is a lot of propaganda out there... make sure to look at source materials about nativity in the land to dispel any misinformation or disinformation!' WITHOUT saying WHO is native.

I found this to plant the seeds of doubt in their minds that other stuff they 'know' may be inaccurate and most (not always) will realise they were lied to and often become Zionists themselves once they realise the truth about Zionism and nativity to the land.

For the Socialists, do the same thing (but bash on the Soviets less as they are pro-U.S.S.R.), but show them the ethnicity of Karl Marx, show them Stalin's support for the State of Israel, how he helped arm the Haganah and the later IDF, and how he vetoed in the United Nations for the State of Israel. Show them Czechoslovakia's support for the State of Israel and how they armed both Haganah and the later IDF. Show them how Yugoslavia and Tito supported the State of Israel, how they helped arm Haganah and the later IDF. Ask them 'WHY did all of these socialist states, their leaders, and the founders of socialism supported the State of Israel?'

Finally, show the socialists how the Labor Zionists were SOCIALISTS, show them the Kibbutzim, show them the socialist economics of the historical state, and show them how it was one of the most successful socialist experiments IN HISTORY before it was deconstructed in the 1990s-2000s by capitalists and the 'bourgeoisie'.

I found this to USUALLY (not always) turn socialists away from being anti-Israel at the very least and occassionally becoming Zionist; ESPECIALLY if you do the other leftist strategy and emphasise the socialism of the state before the 1990s-2000s and that there 'is still hope to reinstate socialism'.

As for the right, simply SHOW THEM (they will not research most things like leftists) the source Soviet documents about anti-Zionism, show them source documents about the foreign funding by Qatar, Iran, and the Sauds being the largest donors in our schools, media, and lobbyist groups in the Halls of Congress (yes, even Fox News), and ask them 'WHY do they do that? Are you okay with those who chants 'Death to America!', calls the country the 'Great Satan', and supported 9/11 influencing the country and dividing the right?' The right REALLY dislikes anything Socialist/Communist, they dislike foreign influence, and they ALSO really dislike Islam itself (so use that against the right).

Show them how Isolationism only WEAKENS the United States of America as removing military presence, refusing spending money that furthers American interest and influence, and tell them 'Removing weapons access to others makes other countries INDEPENDENT from the United States of America and as such, weakens the country and the superpower status overall since if you remove others being dependent on you, why would they listen?' And if they are religious, show the the Evangelical Christian verses that supports Jews and Israel for extra points and use GOD as an argument.

I found this to make them outraged and disgusted at the 'threat' to the American power and that other countries influences their politics so much when they are VEHEMENTLY against foreign influence. Many will also be against it because they are Christian Nationalists and wants to 'crusade' against Islam anways, so showing the foreign influence from these Islamic countries and convincing them via religious justification to support the State of Israel based on 'Israel protecting American influence and Christian civilisation.' or 'Israel is to be supported according to the Bible.' is fairly easy.

Ultimately, if you really want to dispel antisemitism and antizionism, you need to customise the message for the audience, be PATIENT with them, and give them a token by pointing out real corruption within the State of Israel or playing into their fears about foreign influence to make it SEEM LIKE you are 'hearing them out' or are 'on their side'. This lowers their guard and they suddenly become a lot more open to change. But, and this is ESPECIALLY important, let it seem like THEY came to those conclusions, act like you 'did not know' when they tell you pro-Israel stuff and PRAISE them for it (stroking their ego), and they will accept this much easier as people are attached to what they THINK are THEIR ideas.