According to the Bureau of Labor Statistics, "Police and sheriff's patrol officers and transit and railroad police have some of the highest rates of injuries and illnesses of all occupations."[0] It's certainly not the deadliest job, but I'm guessing it is vastly overrepresented in deaths & injuries compared to most jobs (and many potential officers' next best option).
In 2021 police & detectives in the U.S. had a median wage of ~$66k[1], lower than the national median of ~$71k[2]. Again, not the worst paid by far, but below median.
Obviously a lot of this depends on location; different areas have vastly different crime rates, and police in a wealthy suburb probably are very well-off compared to the night shift in inner cities.
Police work is far from the worst job you can get, but it still seems harder than a lot of (most?) other work. Though I don't feel qualified to make a subjective comparison to other jobs of similar pay & starting requirements.
I'm not sure what you mean by police unions trying to stop car chases. Presumably chasing criminals through sometimes-dangerous situations so they don't get away is a core part of the job description?
[0] https://www.bls.gov/ooh/protective-service/police-and-detect... [1] https://www.bls.gov/ooh/protective-service/police-and-detect... [2] https://www.census.gov/library/publications/2022/demo/p60-27...