I think that a good thing to mention is the Great March of Return, how a large segment of the population of Gaza was dedicated to pursuing peaceful protest to reclaim their old homes and free prisoners, and they were met not just with rubber bullets and tear gas, but live ammunition, notoriously snipers aiming for kneecaps and essentially competing seeing how many they could shoot, like American settlers gunning down buffalo.
But really, what they are asking for is why you are anti-zionist. Unless you think you've been groomed by hexbear (since that's the popular allegation, or so I've heard), there's no way any of us know the answer to that better than you do. I have nothing against sharing resources with them (maybe spare them the gore if you can), but I think it'd be most effective to give a personal history of your beliefs and what persuaded you. You believe it for good reason, don't you? Then talk about that!