First of all I really wouldn’t put much weight on the voting results in an area where Hamas uses violence for decades to keep in power. Especially if there isn’t any semblance of a modern democratic state such as regular(!!) elections, freedom of speech and a free press. A 1-2 generation long youth indoctrination like the Nazis did also really doesn’t create an educated and politically mature population.

And of course 53% still leaves a huge amount of people who aren’t in favour. Not to mention that there is a 70+ year long ongoing conflict which has left pretty much no one in Gaza (or Israel for that matter) who doesn’t know someone getting hurt or killed by the opposing side’s actions. It’s hardly surprising that there’s hard feeling (major understatement) in a lot of people.

And lastly we certainly wouldn’t want to use public opinion as justification for killing civilians. That’s the reasoning the likes of Osama bin Laden do to justify shit like 9/11.

TL;DR: This conflict is complicated as hell and basically a self fueling cycle of hatred where even the good side is acting very shitty a lot of times.