Zionism is awesome for Jews.
After WW2 Jews essentially had a cultural golden ticket. They could have perpetually ridden the wave of being treated as the world's most victimized group forever. There was almost nothing worse a person could be than an anti-semite or Holocaust denier. Zionism broke that spell, and "anti-semite" has become a bad joke.
80%+ of Jews worldwide support Israel
Support Israel how though? 80% certainly don't support the current government, or the settlements. Also, look how many Americans support(ed) Trump. Does that mean Trump is "awesome" for Americans, or even for his supporters?
Slavery ... directly benefitted them.
I disagree. There were certainly material benefits but, ultimately, I don't think anyone is better off because of slavery. America still is unable to reconcile with it's own history, and that has had some pretty obvious consequences for everyone.