I could well be wrong, as I based my assessment on my own experience only. That cops I knew in the 1960's and 70's were tough, but they were (mostly) gentlemen. I'm just not seeing that "gentleman" part today. And, yes, that does matter. Cops have a very tough job, but they are also supposed to behave in a professional manner at all times.
Being courteous is not a sign of weakness. it is a sign of professionalism. You can be courteous and no-nonsense at the same time.
I'm quite sure that if we had the ability to teleport back in time, we'd realize how our memories have deceived us. We'd be pleasantly shocked at how sane society once was.