About the bad-boys, it is just simple numbers

In our Gynocentric world there are very few "Good Men"
Men who are good looking enough AND want to settle down.
They are snatched up early, and usually stay commited.

The guys that you would want to set up your mother with are probably all "Nice Guys", and every one of them she will reject.

This leaves only the Bad-boys

Here, Wheat Waffles explains it fully