Our prisons are nearly full.
There are only three things that you can do in this situation. 1. Build more prisons, 2. Send less people to prison or 3. Let some of the people in prison out. It looks as though we are going to exercise options 2 & 3 despite the fact that doing so increases the danger to the general public.
My personal plan would be to make sure that there are enough prison places to house all those that should be in prison and make some real effort to have less people committing crime in the first place. We really should decide on how many prison places we need based on our sentencing policy, not the other way around.