Yes, it is difficult to see, also those traits you listed are also common for women.In my experience, it was harder to See when the bad boy is feeding through a victim mentality, through softness and through what appear to be expressions of love. This is something to think about when we insist on treating each other a certain way - 'don't be critical, it's not loving' - which we've seen in a few threads recently.
The permanent clinger type mentioned, or the mental illness type, or someone who is looking for a parent - these bad boys can be very kind and caring, gentle, etc. - all the attributes normally associated with a loving person. This strategy is adopted in counterposition to the ruthless, exploitative world out there, and it can be quite alluring. Men who take this road seem to be very precious..
Feminine vampire or the waif or however one wants to call them. All nice, innocent and sweet - and yet deadly.
And since those traits usually come in combination (according to the books I´ve read), i.e. shopaholic + alcoholic, one can see the psychological and financial damage they can do. Or clinger + mental illness - one that has serious problems and yet "cries and begs and can´t live without you". Emotionally draining and sucking the life out of men.
I think that both women and men need to understand that they cannot change them. If that person wants change, they need therapy and professional help and support.