This is a vast oversimplification of about 70 years of massacres, death, and hatred on both sides. For the past 20 years or so, Israel has been incredibly brazen in its destruction of Palestine and colonization of Palestinian lands. At the same time, Palestine is literally controlled by a terrorist organization that is not even trying to attack military targets and instead seems set on some sort of vengeance (while using Palestinian citizens as human shields). So neither are good, and both seem set on genocide. If you had to pick one, stand with Palestine but denounce Hamas.