Al Gore once titled a movie of his "an inconvenient truth". The premise being that the truth can be isn't convenient, pretty or profitable. It's an argument that was widely embraced by the left when it was in there favor. Now that it is against their favor it is condemned (flashbacks of wikileaks anyone?).
Milo has previously stated that in today's society only trolls are allowed to speak the truth. This position used to be taken by the court jester or fool, the one person who could speak freely, to say what no one else dared. In today's society sites like 4chan have become the fool, saying what no one else dares.
4chan or it's replacement while always exist because history has always demanded that the truth be told, no matter how politically incorrect it is.