Ya know - I really don't care one way or another what happened over in the sandbox
when it comes to chosing a training instructor. I care about what and how they train today - as in it is just within the realm of probability that if they did not perform well in the past they just might have learned from that experience/episode and are now on the good side.
Drill Instructors at Boot Camp yelled and scremed and tore recruits down so they could be rebuilt according to the plan specs. There should be no need to do that, or to intentionally place anybody within a danger zone, when conducting self defense training. If you want to get and maintain my attention (as opposed to making me stop my train of thought to consider what kind of jackass you might be) unleashing a string of profanity-laced threats at me is
not the way to go about it. If there is a need for the student to eperience and deal with the adenaline-fueled panic of being in a firefight force-on-force with simunitions or airsoft can come as close as needed without risking putting an additional opening in anybody.
As for the "tactical advantage" offered by CC - if it were possible to collect data showing that one way or the other actually makes a difference I would be willing to consider the issue. In the meantime I take the personal preference thing one step farther than many (most?) folks - cops, officers in tin-pot armies and I all wear a pistol openly as a sign of authority. The cop wears his where folks can see it to remind them he can enforce the law with everything up to and including deadly force. Tin-pot army officers wear pistols where they can be seen as a symbol of their authority to tell other people what to do.* I wear mine openly to declare my authority to defend myself against assaults by those who would otherwise want to harm me. It's all advertising.
stay safe.
* I never could figure out tin-pot army officers - they go around yelling and kicking a bunch of folks who each have a rifle and cartridges. Takes guts or a lack of thinking - not sure which.