

I mean, that’s not a uniquely Muslim concept. I think that’s pretty universal, although we don’t have a word for the concept in English. It’s just considered unhygienic.
Unless you mean to say that when someone has used a utensil it is permanently tainted.
The death penalty is not an effective punishment, it is a security measure and should only be used if confinement is unsuccessful and the risk is sufficient, which should be a high bar.