Girls only want BAD guys??

Here's the deal. Few days ago, I have an argument with a guy friend about why do girls go for BAD guys. So, we started in a good, polite, nice and smooth talk. Then, it became fierce, anger bursting out, screaming, throwing stuff and it was CRAZY. Well, he just broke up with his girlfriend for the same reason. She was on with a BAD guys.
So I told him, NOT every girl in this world want bad guys. There are maybe a few, some or even majority. Well, if you asked me, I would definitely pick the good guys. Then he asked again : " But seriously, why do they? I mean, they know that he is the BAD guy but they still clinging like he was the only one. Making us good guys turn to a BAD guys." I answered : " Well, maybe they'd like to have more interesting relationship, rather than plain white papers." Suddenly he make this annoying face and said : " So, you are saying that I am PLAIN??"
We continue talking and screaming :

" I didn't mean that you...are..you know...boring...some of us want a roller coaster relationship."

" What??? Boring? So GOOD guys are boring? "

" NO! Good guys are good...Why would you even care listening to me. I didn't say that you are a boring person. "

" What's the different anyway! You guys wouldn't understand!"

" Wait, you guys??? Are you including me?"

" You say so..!"

" This talking is going no where. I'm leaving. Before that, are you saying that you're on the GOOD guys side? Cuz I don't think you are. Stalking your girlfriend like that!"

So left him sitting there alone. well, who would guess that he would be like that. I know that he was very depressed on breaking up a 2 years relationship with his ex. Since then, I would never talk to a broken heart person. Seriously, NEVER!! But for my girls, I'll always lend my shoulder to cry on.
Conclusion, it doesn't even mater if a girl liked a BAD guy because we have our own opinion. Maybe that guy was a devil to everyone but an angel to his partner. Who knows he had a flowery heart. Or maybe these GOOD girls want their BAD guys to change into GOOD guys for them. Everyone have their good sides and bad sides, it's a mater of telling and showing it. We never know. Only God knows. Its a good thing that we weren't in the library.