That's only a function of how good they are at what they do. They have to engage in over 10 million incidents a year. Any one of those could be a routine traffic stop that suddenly turns into a gang bust and an attempt is made on their own life. They don't have the luxury of foresight of knowing if they're coming home today or not. They know they're a target. Contrast that with your average aeron chair programmer and I'd say their job is incredibly fucking dangerous.
Edit: It's number 15 and only because 2019 was a near record low year, following decades of decline and improved equipment and training. That's a function of how good they are. And if you make them worse or non-existent, crime will go up.
While the construction industry is accidentally dangerous, cops are victims of intentional violence and hatred. They have to deal with drugged out, abusive, angry people all the time. They have to console rape victims. They have to help assess suicides, murders, deadly car accidents and all kinds of unpleasant bullshit. They see death on the job every single day. It's not a walk in the park. It causes unbelievable stress (especially in high crime districts) and it pays 1/3 of what a junior JS dev makes and they don't get stock options or grants
It's 5x more deadly than average occupation and 6x more injurious. It also causes loads of psychological and emotional stress because they have to deal with people going through some of the worst episodes of their lives...all the time.
https://www.bls.gov/iif/oshwc/cfoi/police-officers-2014.htm