Shooting rockets into Haifa is not resisting an occupying army, it's attempting to (and occasionally succeeding in) murdering civilians. If they were shooting them into the settlements I'd have more sympathy.
Your suggestion that the Israeli army has a stated intent to commit genocide is a) demonstrably untrue and b) a dangerously inflamatory thing to say. Yes, those T-Shirts are disgusting, and
IMO the soldiers who wore them should be chucked in the brig forthwith, but to extrapolate that out to mean that the entire Israeli army exists to slaughter Arabs is quite astonishingly ludicrous.
There are Arabs in the IDF, FFS. Israeli Arabs are not obliged to do national service but some do.