There are other professions where people are murdered for doing their jobs - for example, federal and state inspectors are sometimes murdered for performing their duties, attorneys and judges are often targets, and etc.

The difference is what you sign up for when taking a job - those inspectors, judges, and attorneys don't enjoy qualified immunity like police, they didn't sign up for putting their lives in danger.

I understand your point but intent has no bearing on how objectively dangerous a particular job is when it comes to risk of death.

All things being equal, there are many professions far more deadly than policing.