Hackernews is living proof. Pre-election, you could voice a contrary opinion here and have a discussion. Post-election, even the faintest wrongthink shibboleth gets silently downvoted into oblivion.
I've voiced my opposition to what I consider unrestrained capitalism and ideological free-marketerism and been downvoted many times over the years preceding the election.
I've had dang come down on me for expressing my views (it's his and the moderators' prerogative but I'm not stopping either). It doesn't bother me because that's who I am. I'd rather folks offer their disagreements than downvote my comments because that's what I'm here for: discussion and synthesis with the ideas and arguments put forth by folks who share some or none of my interests.
Even you mention "sympathy for the devil." I don't know if that's recognition that some viewpoints are truly toxic and unworthy of even basic respect and consideration or an merely an allusion to the down-voting of un-conventional views and thoughts.
For me, there is nothing interesting to discuss about ideas or views espousing racism or gender-bigotry, but those are different than discussing the factual situations of ethnicity and gender in our society as determined by historical legacies and cultural forces. I will respect the right of an individual to hold bigoted views but that doesn't mean I must respect the individual, either.