Because he’s a murderer
Yeah, we don’t know what the options were that they had at sentencing other than prison. However, I have it on good information that castration or euthanasia will soon be an option for the NFL.
The trouble with this slippery slope is that once we grant a government the liberty to ‘put down’ people for situations we agree with, there may come a time when they start putting down people for situations we don’t agree with, such as being a conservative..
The way to handle this is to let the guy rot in prison. His dejection will be a warning to those who get out to behave themselves.
I am all for capital punishment but if he were sentenced to life in prison, I think it would be a mistake to empower the government to offer him death as an option, not because he doesn’t deserve death, but because governments need to be limited.
“Studies have also been done that show with increased stimulation, a castrated man can actually get an erection, have sex, and orgasm (although ejaculate which would be minimal in volume and not contain any sperm).”
http://goaskalice.columbia.edu/castration-effects
It is forbidden to castrate any male being whatsoever. Though in our days Torah authorities are lenient with regard to non-Jews castrating animals. I don't know if such lenience would be granted to the castration of a human being.