Active police aside, has anybody yet given a good reason as to why a RETIRED police officer should have 15 rounds while a regular joe civilian shouldn't? He's really no more a target than a regular civilian. Is it because retired cops are really terrible shots so they need twice the ammo, what is the reason? A retired cop is a similar target to a civilian and shouldn't be given the ability to defend himself more capably.
The reasoning that occurs to me is their ability to defend, which is still there to a degree even when their off-duty or retired.
I don't see any great distinction between active on-duty and off-duty, retired, in respect to their suitability to be armed.