Didn't your mother teach you that two wrongs don't make a right?
If you're basing foreign policy on things you learned from your mother, you're doing it wrong.
I disagree with Hamas methods and I do not in any way support them. But I disagree with Israel's methods as well. Hamas hiding weapons in a school does not justify shelling that school when it is full of children.
Yes, it absolutely does. Israel makes every reasonable effort to avoid hitting civilians, but when Hamas encourages people to sit on top of known targets it's completely fucking impossible to avoid killing them. The South Park Movie has a satirical bit where the US Military uses a tactic called "Operation Hide Behind The Darkies", which involves having their white soldiers hide behind all the black troops. They also tie black soldiers to their tanks and airplanes. Humorous at the time, but that's essentially what Hamas is now doing in Palestine, except with women and children.
"You can't blow up our rocket launcher, look at all the kids we duct-taped to it!"
And people like you just lap it up.