"The Detective" is occasionally shown on TCM, and is well worth keeping an eye out for. They make the character a little more bumbling, but not in a mean way, and it's quite a romp :)
I find religious people in general to have greater decorum. Maybe it's a greater superego, but a person who is ingrained with moral authority tends to monitor his/her conduct.
(Maybe this is why the current actors seem stunted. The actors of the earlier eras, both male and female, exuded not only a maturity but a moral authority. But they came from a more traditional society.)