Similar reason I curse like 99.8% of whites, really. Imagine being told all your life that you just have to live with your oppressor killing you in one breath and having all the choice in where they live, where they work, and how little they get harassed in their day to day in the other; knowing you will never get any of those same benefits, and don't get to even entertain ideas of separating yourself off from the people who have made sport of having you killed in the streets without getting finger-wagged for "being a 'segregationist' or 'genocide enthusiast'".
Imagine knowing your community has only been fully and truly free for all of about thirty years, between the end of Jim Crow and the start of Joe Biden's crime bill; and knowing ever since then, things have just gotten worse for you and yours-- and the settlers who have enslaved, raped, killed, and made tap-dancing minstrel-show misleaders of hundreds of thousands if not millions of your people over the centuries of oppression say it's 'legal'.
What Palestine lives through is an accelerated, more-brutalized iteration of the Black struggle for liberation; and as a result, it's an absolute riot to me that these crackers in the West expect me to up Israel, to up Little Amerika, knowing everything I know.