Baseless claims, even if they somehow turn out to be right, are still baseless and add little but information to a discussion. This insistence that every thing is abstract and thus all "opinions" are equally valid is how we got in this mess to begin with. No matter how many neonazis shout it, there's no evidence to suggest their claims of racial superiority, no matter how many times it got repeated on fucking national tv there is no evidence Planned Parenthood harvest the organs of fetuses, every image macro doesn't have to necessarily match the caption no matter what Tumblr might claim, and not matter how much money Exon spends there's mountains of data suggesting anthropomorphic climate change.

If you opinion is so unsupported that it fails basic due diligence, it shouldn't be appearing with equal weight to the supported thought. And we should continue to hold aggregators responsible for letting that shit filter to the top. Googling "food that cures cancer" should result in "No food cures cancer go talk to your oncologist" not "list of top ten super foods" from blogspam site number N; Googling "did the Holocaust happen" should result in "yes" not a link to stormfront.

I agree there certainly is a grey area when deciding on public "fact" in developing issues or contriversal subjects; but there are plenty of things far and away from that grey area and to pretend they aren't is worse than censorship. By treating valid information with the same weight as invalid information you've removed people's ability to find the facts even more effectively than if you tried to censor them (given how terrible attempts at censorship have been in the past, I wouldn't be surprised to see tyrants move to this form of information suppression).