My only points here are these:
1. Some people seem to think that the Jews took over a Palestinian state, which is not true.
2. Some people seem to think that Jews should not have been allowed to move to Palestine because it was Palestinian land. Coming from anyone other than the KKK this seems a bit odd and hypocritical to me.
3. Based on this (and the rest of the history of that time) I have trouble finding the moral principle on which to base opposition to the Israeli state. Pragmatically, I get it. You might think it was a bad outcome for the Jews and for the world as a whole. But I don't see where an average liberal could be outraged at what was done.
1) The Jews took over a colony of Britain in which the population was mostly Palestinian, although there was a significant minority of Jews.
2) I don't know who is advocating Jews shouldn't be allowed to move wherever they feel like, including Israel. The problem is with the establishment of a Jewish state. If there was a large minority of Jews living in a Palestinian state (sort of how the arrangement was before 1948 anyways), nobody would have a problem with it. And before you scream anti-semitism, it is impossible to know how Palestinians would have felt about Jews without the history of the last 60 years.
3) Yes, taking into account Europe's history of anti-semitism, it did seem like a good move to move the Jews out of Europe. And an "average liberal" may in theory be in favor of a Jewish homeland, especially just a few years after a holocaust has been conducted against them, but that same liberal would also be absolutely appalled by the way the Israelis have handled themselves from 1948 onwards.