Well, this attack, if it even happened, was more of the exception than the rule. Israel murders more Palestinians than Palestine murders Israelis. I deny that story you posted even happened. It was a hoax, like Benghazi.
Those you call "bloodthirsty animals" are actually just functioning members of society that just want to protect their land and their culture from actual aggressors. Ideally, we would have a ceasefire between these so-called "animals" and the Israelis, but if, heaven forbid, that were not to happen, better the Israel aggression neutralized by all means necessary than for it to continue.
We don't always have to approve of what people do (I, quite frankly, don't always applaud my own actions), but what are we to call ourselves any better for condemning our fellow man as "bloodthirsty animals" instead of looking at who they really are: Liberators.