Why free criminals?

It seems more and more criminals are being released to the supervision of probation. Many of which are violent in nature, or in need of “drug rehab.” I don’t hear anybody recommending that the probation department should have more staff to deal with this trend. Are we out of jail space again? What’s the law enforcement, correctional & probation agencies’ take on this? I’d like to know. The judge knows which individuals are salvageable. He dealt with many of these people when he was DA. As a law-abiding taxpayer, I’d like to know. What gives?