You've not heard of roofers or delivery drivers having high death rates on the job? Those are two of the more commonly known ones in my experience. I remember hearing about pizza drivers getting robbed and killed when I was in high school looking for a summer job.
Many of the most dangerous jobs (both in terms of deaths and injuries) are ones that require working on or along roads, because cars weigh a lot more than humans.
Here's the first Google search result when I searched the question (specifically for deaths). Police officers are ranked 22nd overall. The data came from the "U.S. Bureau of Labor Statistics Census of Fatal Occupational Injuries."
Does it surprise you that you're more likely to hear about a police officer's death than a roofer's death? I don't mean that question facetiously, genuinely wondering if I just have a blindspot there but the reasons for that seem fairly evident to me.