Private prison companies like GeoGroup usually have contracts guaranteeing minimum number of beds filled. This generates incentive to put more and more people in the system to maintain profits. Prison companies are the main reasons you see home monitoring, probation and parole systems getting gutted. They are much of the reason why we incarcerate more people than any other country, and more than any other society in human historyt in numbers and percentage with the exception of the Soviet Union under Stalin.