It seems "Maybe an alien megastruture" is now in the list of politically correct unsayables (like, and I am totally making things up now, "Trump is not wrong", "Mabye blacks have police problems for a reason" or "Maybe Israel is kinda fascist") One immediately has to declare self-disgust at even have been forced to utter the words, state that anyone delecting in this kind of crimethink is a nutter and make references to tinfoil. And one may still get invited to a ritual disemboweling on CNN.
Biting the hand that feeds IT
