This is interesting. I was going to offer what I thought were counterexamples, such as abortion, masturbation, and drug use, but now I'm not so sure.

For one thing, the "something" that should be done might simply be to prevent anyone from feeling horror (such as for masturbation) and for another it seems that there should be ways to mitigate the negative consequences of 'horrible' things (such as for abortion, by transferring an unwanted fetus to an artificial womb for adoption, or deliberately mitigating the unwanted side effects of drugs).