Actually, 'target' is really the wrong word, from what I understand of the weapons they use, you can't really target anything, you just point them in the general direction of Israel and fire. That doesn't make it acceptable, but, then, as the last shell-bombardment shows, neither side seems overly concerned about civilian casualities on the opposite side if it is in the execution of their little spat.
Fact is, Hamas was voted in because of Israels actions, not its existence, I personally think Palestine would not have voted for them if it hadn't been for the way Israel treats the Gaza area, it's like a protest vote, our current Mayor in London is there because of a protest vote, it's not that we liked him, it was that we hated the alternative, and I have a strong suspicion that's the motivation behind the formation of our entire government in the UK at the moment.
It's the situation breeding the anger, not vice versa.
Edit: In short, the current 'Road to Peace' is a Ringroad, and we are going round and round in a cycle of action/reaction/accusation/counter-accusation.
The Circle Must Be Broken.