Because anyone can edit the articles, perceived bias is not imposed from the top down.
Unfortunately that might be not true:
frontpagemag.com/2011/08/23/how-the-left-conquered-wikipedia-part-1/
frontpagemag.com/2011/09/01/how-the-left-conquered-wikipedia-part-ii-coddling-progressives/
"The Wikipedia entry for Che, the top google search result for “Che Guevara,” is an example. The 12,707 word entry features a single paragraph with 235 words of criticism – a modest 1.8 percent rate. This suggests that a Marxist revolutionary who commanded the guns executing the “enemies of the revolution” after the fall of Havana is far less controversial than Ann Coulter. And when one frustrated Wikipedian described the entry as a “hagiography” and protested the exclusion of the work of prominent Guevara-critic Humberto Fontova, whose analysis of the revolutionary’s nihilistic violence stands as an antidote to the romanticism of his apotheosis as St. Che, he was rebuked by a high level contributor (one of the 4000 most active) with the telling handle “Redthoreau.” The justification for the exclusion: facts from Fontova are “written in an hyperbolic and un-encyclopedic tone.” Thus Fontova’s informed view of Guevara’s bloody career is missing from the entry because Redthoreau objects to Fontova describing Che as “revered by millions of imbeciles.” In contrast, the Wikipedia entry for another of the Left’s icon, Noam Chomsky, asserts that America is a genocidal terror state worse than Nazi Germany, a sentiment even many leftists would characterize as hyperbolic. Yet Chomsky has the most detailed and respectful entries of any political commentator. And as of mid-August 2011 his page had an even higher level of protection than most living persons: a lock logo with the warning that the profile could not be edited by unregistered or new users.
Incidentally, Fontova’s own Wikipedia entry is 826 words, 432 of which are criticism, an unusually high 52 percent. Unsurprisingly, the primary author and watchdog of Fontova’s entry is Redthoreau."
Cannot say, whether this criticism of wiki is objective, but it confirms my personal impression, anything remotly dependent on political views (and religion also depends partly on that) at wiki im very sceptical of its objectivity. And its realy a nice article for a communist murderer:
en.wikipedia.org/wiki/Che_Guevera
And it is locked.
But try, maybe the bieas is less serious than i suspect.