While I agree mostly, you should keep in mind that SEAL's, Army Delta, and other SpecOps are trained to kill. There are no cowards that apply for those positions. They just wash out for various reasons.
"Most police forces accept anyone that shows up and then most of them graduate and too often because some PC rule forbids being too hard on the applicants and particularly women."
You do make a point there. However, they are not trained to be killers. They are about law enforcement while dealing with stupid drunks, domestic nonsense, traffic, etc. on a daily basis. That said, I've learned long ago from the Rodney King riots in LA what cowards LEO's can be and how dis-functional their leaders are. I watched live on TV as they pulled out of ground zero and Los Angeles burned for days.
You do make a point there. However, they are not trained to be killers.
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You raise an interesting point. And, the answer is, I think, that a sizable % of the force should be guys that went through an abbreviated Seal Training that weeds out the cowards. Going into a building with a live shooter takes genuine titanium balls. Few police forces have those type guys! So, this “wait outside till all the kids are dead” will continue happening.