"The good guy" and "the bad boy" aren't boxes that all guys fit into. Most of us are a combination of the two. Or we can play the role of either when it benefits us most. LOL

Who cares why they do. If she's the type that wants to be with a bad boy, she's not the type you want to make any emotional investment in. You may want to party with her, but you'd be better off leaving it at just partying with her. Even if you are a bad boy, once the newness wares off, she's looking for her next bad boy.

They think they can change them

All boys have the potential to being bad... Lol as a girls can equally be as horrid - we all are a mix of something and that's not bad it just takes the right other half to balance each person out

WOMEN don't date bad boys.
GIRLS date bad boys.

They think they can change them. It's foolish

Not all women do. But some find them exciting, or think their love can "change" them.

Because they're stupid. The good news is that if all you want is to get laid, you can use that to your advantage.