negative reinforcement encourages negative behavior in subjects with varying results but systematic abuses you'd find with the likes of British boarding schools where a theory suggests homosexual power dynamics often found in such environments void of women produces predators (Jimmy the SAville) or the horrible Ceauşescu's Natalist policies that resulted in the ban of contraception and abortion in hopes of an increased economic output from an increased population (wtf) resulted in an entire generation of unwanted children growing up under state apparatus....

positive reinforcement I think is better.