All I can say is: it's the freaking
opinion section. It's
supposed to have loons who are Obviously Totally Wrong. I dunno, it's like complaining about newspaper comics as being Fake and Made Up stories. Well yeah, that's what they do, they're humor. (And which writers people think are totally wrong varies. Also, most people don't "believe in" evolution, and that's just as much a fact.)
Now, if the NYT hired him to do beat reporting? Sure, raise the alarm then, but for opinions, no. (Unless he proves to be a shitty writer, in which case he should be fired on those grounds.) Put things another way, Will / Krauthammer have been infuriating hypocrites who are ludicrously wrong over at the Washington Post for a long time, and big deal. I know what I'm getting into if I read one of their columns, and they're decent writers at being wrong usually.
This is kinda random, but you ever read "The Road to Wigan Pier" by Orwell? It was funded by the Left Book Club, an English socialist organization, but also included some of Orwell's idiosyncratic takes on why socialism hasn't already taken over. Because the socialist movement was and is endlessly spending time shooting itself in the foot by Socialist A and Socialist B accusing each other of lack of purity, or not understanding the meaning of "diacletic" in the same way and thus being a class-traitor or some such, the editor, Victor Gollancz, put in a ludicrous (but very sincere!) prologue talking about how while he doesn't agree with everything Orwell says, it's a really good work, and only the worst kind of fascism could have an "official platform" where any deviation is forbidden, so I'm publishing it anyway, and please don't get mad at me fellow socialists because Orwell dared say something bad about the current socialist movement tactics. (
https://en.wikipedia.org/wiki/The_Road_to_Wigan_Pier if you're curious in more.) It is a sign of strength, not weakness, to include multiple points of view.