I've had a few debates with people in (in "real life"), and as I'm an artist and generally keep artists for company, I'm pretty much alone in my position that Israel has the right to eradicate active threats to its people. The discussion always devolves into who threw spitballs at whom first, (e.g. "Hasn't Israel had a tendency to overreact in the past?" as if that has any bearing on what's going on right now) and the fact that Hamas was launching rockets at Israeli population centers during the course of the cease fire is ignored or waved aside.
So, forget who was naughty first. Hamas launches rockets at Israel.
If military retaliation is not the correct response, then what is?