A Dilemma For Hamas

Now that Hamas has won a decisive victory to become the government of the Palestinian Authority, they find themselves in a precarious position. Fatah could always disavow rocket attacks on Israel by claiming it couldn't control the Hamas militants. Now that Hamas will form the government with a significant majority, will rocket attacks by it's militia members be taken as a declaration of war by Israel. Could be dicey.

Emanuele Ottolenghi in the National Review Online expands on this;

There will be no excuses or ambiguities when Hamas fires rockets on Israel and launches suicide attacks against civilian targets. Until Tuesday, the PA could hide behind the excuse that they were not directly responsible and they could not rein in the "militants." Now the "militants" are the militia of the ruling party. They are one and the same with the Palestinian Authority. If they bomb Israel from Gaza (— not under occupation anymore, and is therefore, technically, part of the Palestinian state the PLO proclaimed in Algiers in 1988, but never bothered to take responsibility for)— that is an act of war, which can be responded to in kind, under the full cover of the internationally recognized right of self-defense. No more excuses that the Palestinians live under occupation, that the PA is too weak to disarm Hamas, that violence is not the policy of the PA. Hamas and the PA will be the same: What Hamas does is what the PA will stand for.
(....)
.....unless Hamas reneges on its ideology and endorses a new course, then Israel’s claim that there is no Palestinian partner is vindicated. The resulting Israeli policy of unilateralism is vindicated. Israel''’s argument that the Palestinians do not want peace is vindicated. Israel'’s argument that Islamists'’ nuances and differences of opinion are just tactical, not strategic, is also vindicated. And the prospects of a Palestinian state will become even more remote.