A significant proportion of Wikipedians (and free-culture people outside Wikipedia) also have those views, which is why I'd guess suing is unlikely. It'd result in a big flamewar within the free-culture community, with various commentators denouncing the Wikimedia Foundation as out of touch, setting dangerous legal precedents, etc., so they would likely only resort to if they really felt they had no other choice.
(I agree with your sentiment.)
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