People with knowledge or expertise are able to change them too. It's a collaborative effort. It's not perfect. Rehashing this fact of imperfection again and aga

People with knowledge or expertise are able to change them too. It's a collaborative effort. It's not perfect. Rehashing this fact of imperfection again and again is mostly useless activity. But considering how much information there is in Wikipedia, and how good it is in general - and excepting publicized outliers and targeted sabotage efforts, it's pretty good - I think you could do much worse than asking these particular strangers. Of course, I understand that each time you need to find out some piece of information, you conduct your own thorough and independent research. If you need to know about the life of Richard III of England, or when Joseph Tito was born, or how many noun cases there are in Finnish, or what was the Cranbrook Colony - you go to the nearest University library, find and read all the books on the subject that are there, then proceed to update with more up-to-date research papers on the subject and conclude it with personally verifying the facts with leading living authorities on the subject (which stand by being called on by you and supply with the data you need). Other people don't have time for this, so they use Wikipedia for the same, and are OK with a tiny risk of getting one of the facts wrong in tiny number of cases. I don't think it's so terrible.