This has been a problem since Wikipedia's existence. I've had the (mis)fortune of personally knowing people who were charged with serious crimes - serious enough to garner nationwide attention.
The stuff that got printed in the news was at times just plain false. Stuff that anyone in our town could easily confirm to be false. A reporter would hear something wrong, or interview one person who misspoke, and (s)he would never fact check. Eventually those inaccuracies would end up not just in Wikipedia, but in books written by experts on the case in hand.
Even recently, my company has been in the news a lot (negative news). You'll get stories where anonymous employees are telling journalists things about changes in the company. A lot of it is flat out wrong.
The stuff that got printed in the news was at times just plain false. Stuff that anyone in our town could easily confirm to be false. A reporter would hear something wrong, or interview one person who misspoke, and (s)he would never fact check. Eventually those inaccuracies would end up not just in Wikipedia, but in books written by experts on the case in hand.
Even recently, my company has been in the news a lot (negative news). You'll get stories where anonymous employees are telling journalists things about changes in the company. A lot of it is flat out wrong.