You can waffle about if it was or wasn't necessary, but the end result is that Israel is, if nothing else, facing a massive blow to public and western support as a result of their response - a response which seems more punitive than effective. This is incredibly dangerous for Israel, and what they've done may have hurt them in the long term more than help them. The American invasion of Iraq or Afghanistan has some parallels....
I don't have all the answers, I just call it like I see it.