[Black Baron]

The question of "did he deserve it?" is irrelevant since he did. He was a leader and inspirer of a terroristic group that wants us dead, regardless of our location. Inside 1967 borders or not, they will still kill us at any possibility available.
The question of "how was it useful" is relevant however.

I think that killing him was a correct thing to do. In the short time it will boost the violance, but in the long run we will have weakened hamas. Yassin was a charismatic leader. Such people do not grow on trees. For example-the capture of Ochalan reduced the activity of his cronies to almost 0.

The squabble for power is even now under way in this organization.

You must understand, that the leaders take a very big care of themselves, and do all the dirty work with the hands of other brain washed dolts. If we kill one, then another, and another, it will bring to power clashes among the group, as well to an understanding-if i will be the leader, i will end like yassin.

Then we will have some peace talks and negotiations.

Btw, did you hear the news that a 10 year old boy was given a bomb to carry in his school bag?
(he was the first one among the suicider children. happened a week ago).