He may have PTSD and he may have had 1,000 hours of firearms training, but if you empty your magazine the way he did, under the circumstances he did, you’re incompetent to be a police officer. Period.
And even he apparently recognizes that since he resigned (though whether he’ll just go get hired the next town over is probably a decent bet).
Reread A Fire Upon the Deep just a week or two ago.
Amazing SF writer.