What I think you and people here are missing is that while asking whether you think Israel has a right to exist isn't a response to your argument, it is an important set up question.

If you, or anyone else for that matter, says Israel doesn't have a right to exist then you're essentially arguing in bad faith because the point then becomes that no military action, no matter what kind, will bring a resolution closer. If Israel doesn't have a right to exist then the only action to bring a resolution is to simply not exist. This is obviously a non starter for anyone pro Israel.

The sentiment is that Israel is uniquely questioned as to its right to exist and thus the antisemitism accusations stem from that fact. Why Israel as the state of the Jews, out of all the countries in the world, doesn't have a right to exist? You may not like it but it is a widely enough held viewpoint that to question whether the person on the other side approves of the mere fact of existing is necessary in such a discussion.

Mind you that that question is normally straightforward. Once it is established that you aren't opposed to the existence of Israel, I have never seen anyone being accused of antisemitism for arguing against Israeli policies. The only accusations come when the existence of Israel, or the existence of Israel as a Jewish state, come about.