Unfortunately, most of the human rights organizations are up in arms against punishments such as castration. Countries such as Poland and Czechia have considered this punishment. But it could never be implemented due to opposition from the human rights groups.
Yes Human rights organizations are against punishment of castration with knife but they may accept chemical castration such as using pills that kill lust.
And I think chemical castration is best solution for rapists.
I was referring to chemical castration, and not the physical variety. These human rights organizations went ballistic, when certain countries were considering chemical castration for pedophiles.