Wikipedia is very pernicious
I've run into this on more than one occassion. Very bigotted and/or power-mad people squat on vast expanses of intellectual territory in an attempt to control the range of public discourse, and access to facts. Wikipedia is their propaganda platform. Most wikipedia contributors are well-meaning individuals trying to contribute to a public commons, but Jimbo and the cabal, in the spirit of corporate rapine, have taken advantage of those people to exert power in the interests of a few, and to the great loss of the many.
Wikipedia is still useful for math, physics, and chemistry, but once you get into soft domains, it's pure crap.