Many states (California is one of the worst offenders) tend to release violent felons on ‘community supervision’ or ‘probation’ long before their nominal sentence ends. Then they’re ‘surprised’ when said felons commit more crimes while on this ‘community supervision’.
A lot of that is because the prisons are overcrowded. A few years ago they were so overcrowded in California that they had to let a whole bunch of offenders out early.
Easy to say to “build more.” But prisons are very expensive, especially in California where the guards have a powerful union and they make over $100k a year. So to staff a prison costs a fortune.