The problem with Germans in Czechia was their hostility toward Czech. This heightened with the Nazi occupation. They also didn't become "nationless" as they got German citizenship. The everlasting Palestinian refugee crisis is especially created by UN by creating the UNRWA and inheritable Palestinian refugee status instead of demanding other Arab states to give them citizenship. It is not a problem created by Israel, they just have to deal with it somehow.
Amazing how Israel defenders claim Arab states should just be forced to give Palestinians citizenship, yet they justify the existence of Israel by saying "Well, no other country would give them citizenship nor were any safe for them, so they needed their own". That logic applies to the Palestinians right now, but you are too blind to ever put yourself in their shoes.
Remind me an Arab state where Arabs are constantly persecuted for being an Arab. It has NEVER been about citizenship (and yes, many countries have very strictly limited immigration of Jews before and after creation of Israel), it has always been about constant persecution of Jews. When Arabs lost to Jews in Israel Independence War then they started to punish and oppress Jews living in Arab states. Were these Jews responsible by any means? No, their only fault was being a Jew. And it's just only a single example.
You said Arab states should just be demanded to give Palestinians citizenship.
You think Israel needs to exist as a Jewish majority state because other countries did not accept Jewish refugees (e.g. the US) even though those same countries could and would do so now (at least as much as the Arab countries would for Palestinians).
So just think about that hypocrisy. Either being hated and rejected as refugees justifies a state of a group's own, or it doesn't.
I believe that Jewish state should exist. Jews have the right to have the same level of protections that other nations are entitled to have.
If they do not form a majority in that state, it's not a Jewish state anymore, in that state Jews no longer have the protection of the state, they instead are forced to search protection from the state.
It's simple and clear as that. It is also becoming more and more clear that your motivation is simply hatred toward Jews that you are trying to hide with these logical fallacies and simply lying.