that's a common view of morality especially amongst young people,
I suppose it's a step up from the old-style "thou shalt not" absolutism, but it can very easily get all tangled up, especially if negligence can be considered a moral wrong. It might be impossible, or at least meaningless, to legislate against self-destruction, but it can still be wrong without the law.

I think in general, anything that focuses one's attention inwardly on the sensations, on indulgence and physical pleasures, has a tendency to make a person a worse, and a less competent moral agent, because your duty is to others, not to yourself and your senses.
( Moon Girl Technologies horrendous beanbag, Tue 16 Jun 2009, 15:22, archived)