A wiki page listing people who have called it a genocide doesn't exactly prove that it was one, and regardless the israelis have long been oppressing the people in gaza, including illegally capturing land by force for many years, so them striking back would be less a genocide and more an act of war, a warcrime in this instance as they largely attacked civillians, but so does israel which is why both the leader of hamas and israel are wanted war criminals

It's like saying the slave revolts in ancient rome were genocides because the slaves were attacking romans, who else were they supposed to attack? And could you really blame them for striking back at their oppressors?

Ideally it would have been resolved peacefully but the international community turned a blind eye to what was happening, and israel sure as hell wasn't about to stop out of the kindness of their heart