The part cut off as standard circumcision is full of nerve endings. You are much less sensitive after having it cut off regardless of whether it was botched.
Reduced sensitivity is not necessarily bad is what I'm trying to get at. Complete lack of sensitivity is a real problem, a botched circumcision will do that. But a botched circumcision is just like any other botched surgery: a cock-up. Surgeons make mistakes and cut nerves they weren't supposed to in other kinds of surgeries too. To put more stringent labels on an accident, such as a crime on humanity, feels a little extreme.
An intriguing speculation. Might possibly be tested by a survey for correlation between circumcision status and premature ejaculation, though screening out confounders could pose a challenge.