Unfortunately, this article is glossing over the facts. As an American Wikipedia editor interested in this topic, I've witnessed these pro-Palestinian editors arise in response to pro-Israel editors who were colluding to push their own agendas. CAMERA, a pro-Israel lobbying group based in the US, began a covert operation to inject a pro-Israel bias into Wikipedia over a year ago. They were caught, and many of their members were punished, but needless to say their actions caused reactionary actions from pro-Palestinian editors. If anything, there is more of a pro-Israel bias on Wikipedia.