The uneven impact of actual enforcement measures tends to mirror and reinforce more general patterns of discrimination (along socioeconomic, racial and ethnic, sexual, and perhaps generational lines) within the society. As a consequence, such enforcement (ineffective as it may be in producing conformity) almost certainly reinforces feelings of alienation already prevalent within major segments of the population.
Everyone is a prisoner of his own experiences. No one can eliminate prejudices - just recognize them.
If punishment reaches not the mind and makes not the will supple, it hardens the offender.