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Yeah, Palestinians are indeed Semites, however, the word antisemitism (for historic reasons) is used to refer specifically to hatred of Jews. It makes historical sense that Germans are afraid to criticize the Jews.
I probably disagree with your opinions, but the debate would likely be useless.
One of the obstacles to getting that point of view across is that very few of the people in countries with a majority religion (which is most countries) see criticism of their government's history as criticism of their religion. I've never really heard a Christian complain about the treatment of the thirty years war in history books, and that's presented in an extremely negative light. The equation you're making doesn't have a lot of traction in the broader world.
It's not documenting historical facts about Israel that's problematic, it's using that history to justify calls for the destruction of Israel. Does anyone cite the Thirty Years' War to advocate for the destruction of Germany?
One issue that occurs is when person A is criticized for documenting historical facts on the basis that since person B has in other contexts used them as a pretext for something wrong, person C, after finding out about the historical facts, might independently come to the same conclusion as person B. The effect is to treat person A's documentation activity with the same approach as person C's eventual choices.