What is the purpose of conceding a point that is wrong?
This is silly. If my wife or daughter were sexually assaulted and beaten, I might very well lose control of my anger and inflict great harm or death on the person I believed was responsible.
However, I would still be held liable for he harm I inflicted and there is always the chance that I had the wrong guy and inflicted harm on an innocent person.
We do not excuse criminal behavior just because a person is angry and we cannot justify torture on the off chance that someone, somewhere used it (with a good probability of error) because they happened to hold an irrational belief that they were defending their family.