We could release everyone over 55 and still be safer. Violent crime is by and large the province of young men.
How many senior citizen bank robbers are there? I rest my case.
Everyone over the age of 55 was once 50. Everyone 50 was once 45, ... Our actions at age 20 were conditioned on our expectations of the future.
By your logic, if I am 49 and robbing a liquor store, I might as well kill any witnesses, and reduce the chance of a conviction, since the penalty for armed robbery and multiple first degree murders is the same: six years.
Largely true for impulsive, strong arm stuff. Rage murders, violent robberies. Not as true for sexual predators, I believe.