Travis, I do agree with the advantages of .223 over carbines or shotguns, but many in LE have the unfortunate circumstance of shooting each other. There is an over penetration threat inside buildings (and police vests) and a lack of it for vehicles. I think department have to really consider their use in the field. Urban areas favors carbines while rural areas may require more range from a .223.
I can see the pros and cons from a LEA POV, but for me, I’d prefer to have a .223 handy. Pref w/ optics.