As a tangental point that I make about the severity in which we train and apply pins, consider the response as uke. Why would you resist a pin if you knew that pin could cause you physical harm? Consider that it only takes one technique, one time, to destroy your shoulder or your wrist.
Indeed. Nage has a responsibility to not damage their partner, but I think uke also has a responsibility to not be stupid.
While it's probably true that a wrist-focused pain-compliance nikkyo wouldn't stop a determined attacker, it's also true that I only have two wrists. Keeping them both intact is more important to me than proving that my partner's technique is incorrect.