Cops in the US receive training to protect their own safety at all costs, even if that may endanger the lives of innocent people around them. If their duty is to protect and serve, they should not be trained and equipped like this. We don't need to fix crime, we need to fix police training, and yes, we have to be willing to increase the risk policeman are exposed to as part of their work.
On a different point, you mention "bad apples will happen". The expression is "a bad apple ruins the bunch". That is to say, if you don't eliminate all the bad apples quickly, the bunch is ruined.
[1] https://www.forbes.com/sites/niallmccarthy/2019/05/08/the-nu...
[2] https://ucr.fbi.gov/crime-in-the-u.s/2018/crime-in-the-u.s.-...
[3] http://www.bandolier.org.uk/booth/Risk/dyingage.html sorry this data is from 2005, hopefully it's not too different from current