zero negative groups

psychopaths, narcissists, borderlines (individuals cursed with impulsivity, an inability to control their anger and an extreme fear of abandonment)

zero negative because there is NOTHING positive to recommend them

http://www.nytimes.com/2011/06/19/books/review/im-ok-youre-a-psychopath.html?_r=1&ref=books&pagewanted=all

http://www.amazon.com/Psychopath-Test-Journey-Through-Industry/dp/1594488010/ref=sr_1_1?ie=UTF8&qid=1309349951&sr=8-1