I'm not sure the conventional kind of basilisk qualifies as knowledge, as such: Langford's original story was about an image that crashes onlookers' brains through a defect in image processing, not through anything to do with verbal or logical parsing. Most other treatments of the concept have done the same, more or less, although there are some ambiguous ones (like the "Funniest Joke in the World" Python sketch).

There are various presentations of knowledge which clearly aren't mind-safe (and presentation and context usually matter more than the content), but their danger generally comes in the form of bias and related issues like priming effects, which of course is rather well-traveled ground on this site. I think we can explain the effects of bringing up racial IQ differences and other politically sensitive ideas perfectly well within that framework, without having to invoke any more fundamental problems; in fact, we do.