Are you referring to one or both sides? Both sides are firing missiles that are killing civilians, whether they are targeting them is up for debate.
In the case of Hamas, the rockets are a crime against humanity. Even with the mainly structural damage, the practically constant bombing of the people of Sderot and the surrounding areas (mainly populated by Mizrahi which many note as the Israeli government only seem interested in "fighting back" when the rocket target turned towards the richer whiter northern area) who are mainly poor farmers, trapped where they are with no resources, no recourse, and aren't enough bomb shelters in that area, is a tragedy whose scars will be for generations. Also the placing of rocket launchers in civilian zones.
Similarly, in the case of Likkud, the current operations in Gaza are killing many many innocent people, especially considering that Gaza is extremely densely populated. They themselves admit that they strike down most Hamas rockets while dealing the same number of far stronger missiles to Gaza. Even if one were to believe that the IDF were going after only going after very specific targets as they claim (highly debateable) the people who suffer and mainly die are the average, civilian, Palestinian people. Their treatment of Palestinians, and even their own people particularly on the wrong side of popular opinion (there have been riots recently, particularly around race) is criminal.
As far as I am concerned, the civilians on both sides are chess pieces that are being cynically manipulated and sacrificed by their leaders, basically being used as human shields for governments that should be facing charges of war crimes.
But then, so should many parts of the American government who are drone bombing (and 'double tapping' 
) civilians across the world with barely a flicker against them. And North Korea's concentration camps. They are war crimes, but some seem able to get away with it because the institutions put in place to deal with them have failed.