While it is true that criticizing Israel isn't a crime, but often times, pro Palestinians dont just end with criticizing the Israeli government. They often times end up softing towards Hamas, even refusing to call October 7th a massacre but rather, a form of "resistance."
https://www.jpost.com/israel-hamas-war/article-799041
https://www.nyureview.com/university/nyus-pro-palestinian-groups-to-recognize-one-year-of-student-intifada-on-october-7th