Around...lesse, early 90's, there was a report of a shooting involving the San Jose (California, Silicon Valley area) PD.
Cop responds solo to a call involving a mentally disturbed "urban outdoorsman" in a business making a scene. Cop tries to guide the guy gently out the place, he grabs the cop's sidearm. Cop runs away, nut chases, kills him.
Somebody back at the business sees the gun-grab and chase, calls it in plus the cop makes a sketchy report while running. A huge number of cops come screaming in from every direction, and spot the nut running from out of an alley into a large street, waving the gun overhead. Cops open up on him with an avalanche of lead.
One of those cops uses a shotgun with 00 lead from 50 yards out. One of his pellets bounces weird, hits another cop just under the vest, lodges in his kidney, kills him.
The shotgun has it's place, but there's situations where it is NOT the best tool at all. Some cops don't understand this and think every problem is a nail to the shotgun's hammer.
I don't know what the solution is...there ARE things the shotgun is needed for. One option: use a rifle as the main long-gun, but supply 'em with an NFA-class 14" barrel pistol-grip shotgun as a limited-ammo, special purpose weapon versus "the first thing to grab when it gets hairy".