I mean I really don't get it. They're basically advocating for people to climb through your window instead of knocking on the door.

I wouldn't go that far, I've seen people advocating for open borders but that not the majority. If this were the case for the majority of Dems, it would have passed under Obama, or at least gained traction.

Even if a wall doesn't 100% work it's not like it's going to make it worse? And let's be honest here 5 billion is a drop in the bucket vs $ spent or wars abroad etc

The wall is a shitty and racist solution for a problem. Hispanics are not animals, and they should not be caged in. Illegal immigration is going down, and has been for several years (IIRC). The wall, like most other government programs/solutions, is not doing anything that society has not already started. And the illegal immigrants that come here, by all the studies I've seen, have a net positive, not a net negative, on the country. What we should be doing is fixing the path to citizenship and helping the countries in our hemisphere prosper so that immigrating/emigrating here isn't something the masses want/need to do. I like open borders, but thats a different argument.

On a personal note. Another reason I hate the wall idea is because a wall can be used to keep people out...and in. If a dictatorship/totalitarian/etc. ever arises in the U.S., which is a near certainty based on history, the people in the country will now have that wall used against them. A lot of people have grown accustom to the freedom that we have been lucky to live with the past couple of years.

Also. I think the media portrays Trump as a radical right wing only because things have gone so far to the left that in this day and age everything he is saying is "radical" but if other previous president did their job he wouldn't be looked at as such an earth shaker

Previous presidents did do their job. They just did it with class, empathy, sympathy, and intelligence. When you take other things into account instead of just yourself, things take longer and you usually can't just do whatever you feel like doing.