Anyone working in a stressful job in a stressful unpredictable environment will find themselves hating their life eventually. The only equalizer in this scenario is the pay. If the pay is bad and not proportional to the risk and stress, then the turnover rate will be quite huge. The employee will also find themselves building resentment towards the job.
Individuals cope with stress through different ways. Some will find inappropriate outlets for their stress, while others can cope surprisingly well. In law enforcement, the officers work with potentially homicidal and dangerous people on common occasion. Depending on the department, some cops do not get paid all that well. The danger to pay ratio in this cause seems a little bit off, but that is the risk they take.