While I would not disagree that Hamas have committed the more heinous war crimes, I think it naive and incorrect to believe that the Israeli military are blameless. This is aside from all the anti-peace activity undertaken, such as building of Israeli settlements in occupied territories in violation of international law.
I would suggest reading this article. There is too much to quote, but there are credible claims against the Israeli military of many things, including collective punishment, disproportionate use of force, IDF use of human shields, and misconduct by IDF soldiers.