It would be great to hear a well-reasoned perspective, one way or the other. My stance is that bombing Gaza won't stop the rockets and it will kill civilians, so it is not justified (see above tweet).
The area has a very complex history as shown here. (hands down the best educational video that I have seen in my life) blog.ninapaley.com
Israel itself was complicit in the rise of the Hamas (= extremists). It is notoriously difficult eliminating extremists once they set up a power base and this is coming back to haunt Israel today. online.wsj.com
Now Israel wants Palestine (= moderates) to remove the extremist Hamas while Israel is attacking Palestine, both, militarily and in policy, the very things that feed Hamas?
To me, Israel is quite simply in the wrong. The international community needs to put pressure on them to stop the attacks and work with Palestine to defeat Hamas and offer a much better solution than the one at Camp David.