Us: We hate Nazi Germany! Down with Hitler!
You: Heil Hitler heil Hitler heil Hitler heil Hitler heil Hitler heil Hitler heil (etc.)
Us: Why do you love genodice so much?
Edit:
Also it bears repeating, because you're actively ignoring it, but we're not calling for the death or Israelis or Jewish people generally, but specifically the fascist state that is commiting crimes against humanity in their name. The insistence that those two are one and the same is just fascist propaganda.
It's hard to leave because it's easy to join, and because it has the critical mass of users. Simple as that. It takes a lot to get people to abandon their chats, their friends, their groups, and the years of built-up message history, for an app that likely has fewer users and fewer features.