That's the thing - Wikipedia can be edited by anyone. Who's to say these kind folks won't simply edit history to their heart's content?
I dunno how much impact they'll have on the Internet as a whole, they could posts sites like "DON'T BELIEVE WHAT THE LIBERALS TELL YOU" and then kids would be all "omg tinfoil hats" and get impressionified by these sites and then they'll forever have an incorrect view of important historical events.