I don't follow you. Assuming the policeman's remarks are true, good reason not to OC, and maybe CC won't help you as much as you may think but how is CC going to make it worse? Because your gun will get stolen? Is it gonna matter much when you're down and out already?
Most of the officers I have talked to said that tactically it doesn't make any difference because most robberies involve a violent ambush of the victim whether the perp believes them armed or not. The victim is usually sucker punched or shot or stabbed, then robbed. Maybe a good reason not to OC, but for that matter, maybe not a good idea to CC either.