Which is why you should never rely on Wikipedia. If you want to use it, use it as a starting point. Click through the footnotes to the original source. And if that source is some sort of propaganda organ, ignore it and go find the truth elsewhere.
I think this final paragraph is reasonable guidance. Of course Wikipedia can never be 100% accurate, it is a good start for getting an overview of a subject but if you need to be confident of accuracy then you need to look at the source. That isn't unlike other publications though. It is hardly unusual to realise that what could be described as highly respected news organisations are wrong about some things. The advantage with Wikipedia is that where you spot an issue you can easily fix it, it isn't quite so easy with a news story on the TV yet they both could reach similar numbers of people.