I don't dispute that Israel has been doing the kind of stuff that has produced the likes of Hamas for a very long time now. Nor that what Israel is doing right now is well into war crimes & genocide territory, and should be treated as such- i.e. no military aid whatsoever, severe international sanctions, its leadership subject to arrest and trial if it sets foot into any civilized country, and ideally a UN-sanctioned military intervention in Gaza to stop the bombings, by shooting down Israeli planes if necessary.

That said, by 2006, Hamas already had a fairly long track record of killing "collaborators" and "deviants", as well as several clear-cut terrorist acts against civilians (e.g. blowing up bus stops). The radicalization happened a decade earlier.