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It isn't just a matter of "sacred values". It's a matter of the consequences of making the statement.
"What's wrong with doing if ?" will predictably have the effect, on the margin, of encouraging people to do even when don't actually hold. We can predict this for reasons closely analogous to why knowing about biases can hurt people: Arming people with more rationalizations for bad things that they already were tempted to do will generally make them worse, not better.
Conducting motivated search for conditions under which something normally very harmful can be justified as barely non-harmful is the sort of thing someone would do, in conversation, if they wanted to negotiate down the badness of a specific act.
"What I did isn't real reckless driving. In real reckless driving — the maximally bad sort — the driver has to be driving too fast, while drunk, sleep-deprived, and talking on the phone. Me, I was only sleep-deprived. So stop treating me like my drugged-out ass ran over a dozen schoolkids or something."
(See actual political discussions of "real rape".)