Biologically, female is more important than male, and young male is more important than old male, and old male is worth a lot to predators. Young males beat and exile old males, and predators eat the old males.
People would rather a million young people die than one old male sit castrated in jail.
You could give them eternal paradise, and they'd cry "Noooooo, an old cismale got castrated for attempted murder, noooooo. Now he is calm and happy and friendly and won't hurt others anymore, noooooooo".
People's true wish is to be eternally tortured by old cismales. So, we could jail all people, put then in tiny jails where they can't even stand, tell them old cismales ordered it, and the people would be happy in their jails.