It's because the term genocide has been weaponized. People are redefining the term to be "whatever Israel is doing" to create a false equivalency between what Hamas did on October 7 and the war those actions started. It's a "both sides" mentality from people that confuse sympathy for Palestinians with sympathy for Hamas.

It's very disgusting logic when you think about it. People feel that if they can prove that both sides have committed genocide, then the genocide perpetrated by Hamas is somehow justified.

There's a lot of raw emotion at play here people that have been subjected to imagery of dead children tend not to be able to parse the logic they're promoting.

But in the end Hamas committed genocide, Israel has not. That fact makes it difficult for people to attend protests where people cosplay as Hamas, so it's generally rejected to preserve the convenient narrative and not feel guilty over not having the courage to call out blatant antisemitism.