Unless the quality of life is reduced because they have a false belief that it would increase, and I can prove to a sufficient degree that that belief is false, I'd say "it's pretty much never wrong". Is it really wrong to get paid for constructing a church if I think organized religion makes people worse off? And I certainly wouldn't want someone applying that principle to me, because I know how bad other people are determining what reduces the quality of my life. It's this logic which leads to large soda bans.