If you ambush a music festival and kill hundreds of unarmed people, you're a monster, and you're going to hell. I'm comfortable saying that about Hamas, the IDF, American GIs during World War 2, Black Lives Matter supporters, Trump supporters. Anyone. It's not a "sided" thing.
And of course the IDF and the current Israeli government are also currently committing unspeakable crimes in Gaza every day, starving children and the old, and bombing houses with little babies inside.
Anyone who could possibly disagree with either one of those statements, I'm not sure what I could say to you.