The problem is, one side understands both while the other understands neither.
It's also safe to say that most anti-Israel people are young leftists. That's not to say "all" -- I have a couple of right-leaning Christians on my feed who don't like Israel. Still, polling has been clear for a long time that, the older you are, the more likely you are to be on Isreal's side; the younger you are, the more likely you are to be calling for Israel's obliteration.
I've been trying to play this leftist game on both fronts; but, you can't cajole a moron. Most of these people don't know what the word "cajole" means.
So, here's the reality -- if you're on the left, you have to twist history or lie in order to hate Israel.
I've actually encountered people who seem to think that the Jews came from Europe and simply usurped the former land of Canaan from the indigenous Palestinians. Most of the leftists on my feed don't know the difference between the Philistines and the Palestinians. Even if they did, they don't know that the Jews inhabited the land before the Philistines.
If leftists are gonna play the intersectional, anti-colonization game, they should be pro-Isreal. Most of the Jews from Europe who came to Israel in 1948 were the descendants of people who fled the oppression of the Ottoman Empire over the previous 300 years. The Jews have always been the oppressed minority. The "fishers of men" idea wasn't introduced until Jesus, which is why the Jews generally want to simply be left alone rather than proselytize. The problem is that just about nobody wants to leave them be.
Anybody with the slightest understanding of history knows that a two state solution is what Israel wanted from before the beginning of Israel. When the British took the land from the Ottoman Empire during WWI, guess what, there were both Jews and Muslims in the region, and the British tried to divide the land fairly. The Jews took just about every offer. The Muslims took none.
Still, in the grand scheme, this is all minutia.
If you're a leftist in the West, you have to face the reality that the conflict is between a democracy (however imperfect), with a mostly secular population, with LGBT rights, and a government that, even when the right-wing is in power, it's far more liberal than any government nearby. Somehow, you're calling for the destruction of that democracy in order to replace it with a dictatorship that would murder gay people.
History is that -- history. It's an important thing; but, the present is important, too.
If I bought a plane ticket for anyone who isn't a Muslim to visit the region, they'd be staying in Israel for good reason. If I bought a plane ticket for any Queers for Palestine activist to visit the region, they'd stay in Israel, for good reason. Every educated person knows that 20% of the Israeli population is Muslim. Every educated person also knows that a hypothetical Palestinian state, there would be zero Jews.
Even if you think that there is something sinister about the foundation of Israel, it doesn't change a damn thing about where we are now.
There isn't a nation on earth that doesn't have some form of colonization or conquest in the past. How do you think Islam spread from Mecca?
The important question is, right here and now, do you stand by the nation that just authorized the full right of gay couples to adopt children, or the people who throw gay people off rooftops?