Some people are attracted to the famous and infamous.
They feel if they can get close to a celebrity or a person of (any) notoriety it will somehow elevate their status in society from being a "nobody". It's the extreme of going after the "bad boy".
I suppose we shouldn't be that surprised. Most thugs, drug dealers, gangsters, and conmen had no problem finding women when they were out of prison. It's the psychos that fascinate most.
In some instances these people may in fact believe the criminal is just someone who has been (misunderstood) or was never loved properly. Murderers and serial rapist get marriage proposals in the mail daily. Charles Manson brags about women wanting him!
Nevertheless it proves my theory:
"There is someone for everyone!"
It does not matter what you look like, what you have done, whether you have a job or not, drug addict/alcoholic, homeless, or so on; there is someone out there who would gladly embrace having you for their mate.