Why is being a murderhobo bad?

[Amaril]

What murderhobos do for a living is weird and absurd, and incredibly violent. Why the hell are they putting themselves in those situations in the first place? Normal people DON'T DO that sort of thing.

So, because I'm intrigued, what kinds of games do you play and/or run instead? I fully agree that the frequency with which most adventurers willingly rush into dungeon-crawling murder-fests is pretty implausible, but a certain amount of that stuff is deeply built into many types of games.