Hamas is in charge because Israel disposed of all of its political opponents for it that left the Palestinian people with not much choice. Most of them only voted for them during heightened times of tension and many would later regret their vote. Many people say that Hamas was created by Israel. This is not entirely true, but its growth was nurtured both directly and indirectly by Israel. Even Netanyahu himself admitted of this years ago.

And ISIS is abo-fucking-lutely a highly illegitimate organization. Giving it the slightest milligram of recognition would be the worst thing to do. At any rate ISIS has ceased to exist as political entity (and they only existed as such for a VERY brief period of time) and right now they are just a bunch of disjointed idiots who will occasionally succeed at murdering some people and not achieve anything else at all.