I have a big problem with the way Israel is handling this conflict. IMHO, someone needs to smack them upside the head and tell them in no uncertain terms that they'll NEVER end the violence that is plaguing that part of the world by responding tit-for-tat. They either have to rise above the violence and engage in some serious negotiations or send in their full army, occupy the whole place and suppress it by overwhelmingly forcing them to submit. The former option would be the best, IMO, but neither side wants to negotiate at this time, while the latter option would certainly be very unpopular with the rest of the world, but it has to be one or the other. If you're going to do something, do it right.
For the record, although Yassin got what he deserved, I'm opposed to all killing, especially when a government decides to execute a person with no legal process and no trial. That's a very scary precedent.