Israel isn't relentlessly murderous and abusive because it's run by Jews, it's relentlessly murderous and abusive because that's the only way to maintain an ethnostate that was abruptly dropped on top of an already existing civilization. This would be true if it'd been a Mormon state or a Romani state. 

Take any already existing country with its own ethnic and religious makeup and its own relationships with surrounding countries and drop a brand new artificial ethnostate on top of it with a deluge of immigrants who are designated special and above the people in that region, and you're going to get a ton of violence. You're also going to see the dominant group espouse supremacist ideological beliefs to justify why it's fine for them to be placed above the other group and receive better treatment by the state. These things would happen regardless of what those respective ethnic and religious makeups happen to be.

How can we be sure of this? Because we've seen it happen time and time again in other settler-colonialist projects throughout history which had nothing to do with Jews or Muslims. 

It's not about Jews and Judaism, it's about the nature and character of the ethnostate which got placed overtop a pre-existing civilization in the 1940s. The religions and ethnicities are interchangeable with pretty much any other in terms of how much violence would be necessary to institute and maintain such a state.