It's more dangerous to be a farmer than a policeman in the United States as well. 20.4 vs 13.7 fatal injuries per 100,000 per year. Being a policeman is just not very dangerous compared to most non-office jobs.
How often do farmers go on house calls to calm down a belligerent drunk estranged husband with a gun? Not too often I would imagine. But domestics make up a large proportion of police calls.