This is fascinating. What other things fall into this intriguing category, where doing a Very Bad Thing is ok, but observing that someone seems to be in favor o

This is fascinating. What other things fall into this intriguing category, where doing a Very Bad Thing is ok, but observing that someone seems to be in favor of a Very Bad Thing is downright terrible? And how is a society to defend itself against Very Bad Things, when it's worse to talk about than to actually do? The only reason I can think of why someone might hold such a logically contorted position, actually, is if they actually think Very Bad Thing isn't that bad a thing at all, but won't come right out and say so.