It benefits them because Israel is supposedly “the Jewish state” and because of that, any criticism of Israel is bigotry against Jews. And most people don’t want to be accused of bigotry, especially against a people who suffered a genocide relatively recently.
I’m really surprised this is not something you’re aware of, because it’s been going on for quite some time. Here’s an article about it from 2019, for example: theguardian.com/…/debunking-myth-that-anti-zionis…