Nashwan:
I give you credit for at least answering the article, though I disagree with your dismissal of the article as unworthy of comment (bit of a contradiction, since you did in fact comment). I don't have time now to fully respond, so let me sum it up. Given all the problems around the world, the fact that the U.N. devotes as much time and energy on the Palistinians (and routinely biases that time and energy in favor of the Palistinians) seems dispropotionate. The 5% seems small, except that it is only 1 of the many such activities/committiees that are involved in the Israili-Palistinian issue. To truly get a feel for proportionality, you would need to look at all the activities as a whole, than compare that devoted to the subject issue with the time/resouces directed at other major issues, such as the Sudan or Ruwanda.
By the way, the US does have official definition of terrorism, though there are several flavors of that definition (State Dept vs DoD for example). As for the hypocracy you speak of, there is some here as well as abroad. It's not right, and I don't support it.