Number six on the list of things you evidently didn’t know about Wikipedia:

We don’t want you to trust us. It’s in the nature of an ever-changing work like Wikipedia that, while some articles are of the highest scholarly quality, others are admittedly complete rubbish. We try to keep the ratio of the greatest to the worst as high as possible, of course, and to find helpful ways to tell you what state an article is currently in. Even at its best, Wikipedia is an encyclopedia, not a primary source, with all the limitations this entails. We ask you to not condemn Wikipedia, but to use it with an informed understanding of what it represents.