http://www.cnn.com/2014/01/15/justice/florida-movie-theater-shooting

So apparently the guy had been going around intimidating other people. Seems to me like a cop who couldnt quit being a cop after he retired.

as for your points

a) I did not try to make a positive correlation here between increased carry and decrease, but rather that prior of assertions of other parties in the past that claimed increased carry would result in a drastic increase in violence as a result have obviously not panned out.

b) Probably more accurate to say a lifetime of police service, particularly in SWAT type units makes you more prone to being a bully and having a sense of impunity. In this case that led to violence, but usually probably does not.

The takeaway was that even in a society where peons are disarmed, this guy would still have been armed and this guy still would have felt entitled to harass and intimidate people.

It is an effect being a police officer has on many people. No, it is not something that every police officer becomes. Just like some people who drink become alcoholics, but most people are fine. Some people who spend their life as a cop become this guy.

For who could be free when every other man's humour might domineer over him? - John Locke (2nd Treatise, sect 57)