The UN is a political tool absolutely - and it's one that's biased in favor of Israel.
Look, you have to understand that you and I are looking at this from a western lense. The west is EXTREMELY pro-israel. So your Overton window isnt just shifted a little buddy. It's fucking whiplashed alllllll the way to one side. So yes, from your perspective or mine the UN might appear as not pro Israel.
But um, they are, and quite a bit too. Again, if you want to see actual real anti-israel reporting, read stuff from Iran. You will surely notice it sounds very, very different from how the UN portrays Israel.