Reminds me of the early days in the dojo, as well as the early DT days when there were more folks with military & self defense experience willing to mix it up on the mat.
Nowadays, that sort of training isn't commonly offered as L/E In-Service training because of the liability involved regarding the increased potential for injured employees and worker's comp claims. Besides, just like most cops aren't particularly interested in guns, most aren't interested in martial arts, either. DT training may only come around once a year, or every other year, and only for a few hours, at that.
I could go on about funny (but sad) tales involving cops that aren't eager to become involved in anything seriously "hands on" ... like the time a smaller statured person was facing an antagonist (wearing a fully padded suit) in a DT training situation, and instead of addressing the antagonist/attacker with the appropriate piece of issued safety equipment ... the person turned and fled the room. Hey, that might be something that's necessary in the real world ... sometime, anyway ... but it was weird for it to happen in a dedicated training situation.
It sometimes seems like some folks like to think that threatening situations will always develop along instantly recognizeable patterns, or won't be unexpected & surprising ... That a situation offering the potential threat for serious injury or death will always start out as a recognizeable "gun situation", or be instantly recognizeable by the presence of a deadly weapon, like a gun, or at least a weapon capable of inflicting serious bodily injury.
It's not surprising that many folks participating in a firearms forum may be primarily interested in firearms ... and not necessarily the martial arts, for example ... and may sometimes tend to think of their lawfully carried concealed handgun to be "the answer" to any potentially imminent & immediate threat of serious bodily injury or death that may unexpectedly confront them. It may not realistic, but neither is it surprising considering that many folks may not have the money, time, interest ... or even the physical ability, if injured or disabled in some manner ... to extend their knowledge and interest into self defense avenues which involve the martial arts.
The use of a Red Gun in a properly supervised training situation can often be used to good advantage in demonstrating how quickly someone can be overcome and disarmed, as well as "seriously injured or killed" ... and how sometimes the gun which ends up being used against you is the one that you brought to the unexpected & unanticipated fight in the first place ...
Situational awareness and avoidance are necessary skills, at the very least ... althouigh L/E don't always have the luxury of avoidance, obviously.
Just "having a gun" may not be the "answer" to most situations ... and may certainly encourage a false sense of security.
After spending the last 33 years involved in various martial arts, and having been a L/E firearms instructor & trainer for the last 15 years ... and having been insterested in shooting & guns for about 46 years, beginning when I was 5 ... I realize that there isn't any perfect answer to these sort of questions, and don't claim to be anybody's expert, let alone have any "answers" ...
But it pays to be open to new info.
Stay safe.