Your analogy is not valid. You're ignoring reality, and the posts above which explain it. You are imagining that the women hooking up with these men are so naive/gullible/stupid that they went home with a guy they just met in a bar, expecting a deep long-term emotional relationship.

The truth is, women are a lot smarter than you seem to believe. They know what the men are up to, and they are willing participants. They are not being used. Your analogy would only hold if the bums were intentionally looking to find someone to murder them.