Part of the process is screening for people like that:

When candidates responded that they had no experience fighting, the hiring officers expressed intense anxiety and wariness about their suitability for the job. In one interview, for example, after a 43-year-old white applicant said he had never been in a fight, the sergeant told her colleagues that she thought he would “crawl into himself and disengage” if a fight presented itself, adding, “He’s gonna have to get angry.”