Unlike Hollywood movies, things aren't always black and white. It is quite possible that both sides are. Neither the Hamas nor Nethanyahu government are the good guys. Both sides try to exterminate the other side. Both sides also don't mind killing innocent people in their way.
It is a fucked up situation, and with recent developments it looks like it is turning into Israel's Afghanistan. Biden was right warning Nethanyahu to not make the same mistake at US did after 9/11.