The problem is the pro-Palestine movement irrecoverably linked themselves to Hamas, a terrorist organization, it's made supporting Palestine a toxic position to hold for anyone of any significance.
Actually the Israeli government (Netenyahu) funded Hamas as a way to destabilise the Palestinian authority and conflate palestinianism with terrorism (EU Policy chief Joesep Borrell has stated this on record https://www.politico.eu/article/israel-funded-hamas-claims-e...)