In a conflict so long blaming any one party would be naive, as far as current politics go, Israel is the main obstacle to peace. Hamas doesn't help of course, but Israel could easily marginalize them through dealings with Fatah if they had wanted to cede to a two state solution. The conflict has continued over the past several years because there hasn't been the political will for a settlement in Israel under Olmert or Netanyahu.
Even now the Netanyahu administration is largely using this incident as an excuse to throw a tantrum over the unity government construction and target Hamas like they have in the past in hopes that they can break up the new government. It has been a fairly standard (and unfortunately effective) tactic. Most of the rockets coming into Israel haven't even been fired by Hamas, yet it has been primarily Hamas' infrastructure and activists that have thus far been bombed in the operation and it was primarily Hamas sympathizers that were arbitrarily detained without charge in the West Bank during the search.
Seems like a fairly restrained response considering Hamas's penchant for firing rockets at Israeli civilians. Even if they respond with home demolitions, I'd call it totally reasonable and justified since Hamas's tactics are essentially collective punishment to begin with. Really, all terrorism is just collective punishment committed by a weak force against a stronger one and can only be deterred by the stronger party being willing to escalate to a much more extreme level of violence.
You can start calling the Israeli response disproportionate when Gaza looks like Grozny.
It is largely Jihadi Salafi groups firing the rockets, groups that are actually opposed to Hamas, which is why it is easier to recognize the overzealous targeting of Hamas in the campaign. the same was true of their search for and accusations surrounding the missing students which third party groups claimed responsibility for, but which Netanyahu took the opportunity to blame on Hamas instead and used it as a justification to illegally harass and target Hamas affiliates. The Israeli-Palestinian conflict and its persistence is simply proof that your ideologies are pretty poor tactics when it comes to ending cycles of violence. So in other words, you are a supporter of terrorism. Not surprised.
Israel is the main obstacle? Did you read hamas party covenant?
Let me quote:
"'Israel will exist and will continue to exist until Islam will obliterate it, just as it obliterated others before it.'"
You simply cannot deal with a party who put in its front banner the destruction of your country. Fatah, on the other hand, could lead to something, and as evident, the situation of the palestinians who lives there is far superior to those who live in the gaza strip, and both are bordered with Israel. Furthermore, the Fatah territory is surrounded by Israel, the gaza strip on the other hand has a border with Egypt who decided to close the border to gaza as well.
Trying to reason with an unreasonable person (or party) is futile.
As far as your comment about the overzealous attack on hamas, it's pretty obvious, isn't it? They are the ruling party there, they automatically assume all responsibility for whatever that is fired from their autonomy.
If a group of American soldiers go rogue and murder Russian people in Russia than USA is responsible for their actions. If USA won't execute a punishment I am pretty sure the Russian will push towards one, in what ways they see fit.
Imagine if those soldiers wouldn't get punished by the American government, what repercussions their actions would have.
Same goes for hamas the the islamic jihad.
By not doing anything to prevent or punish the jihad after the action, hamas essentially gave its consent to the actions.
The fact that you over-complicated it by saying "its a group who opposes hamas" (which btw isn't true, they don't oppose hamas, they wish to take their ideology to the extreme), shows that in fact, you support terrorism.
And Zolace is correct, it is a restrained response all things considered. We all know that if hamas would have done the same to the US or the Russians, than the gaza strip would have been flattened long time ago.