Taking this idea even further, all police officers and vehicles should be undercover and unmarked...
And taking the idea to it's other logical end, all police should be in uniform and vehicles clearly identified. Perhaps "Evidence Collection" in big white letters on the side of surveillance vans, and uniforms with a bulls eyes on the front and back for officers assigned to infiltrate the mafia?
Some police officers need to be clearly and quickly identifiable by the public to perform their function. Other than predesignating yourself as a target when trouble starts, what, exactly, is the point of a private citizen advertising his state of readiness?
How about, instead of looking like a steak and hiding nasty gristle inside, I just look like gristle? Most crooks don't like gristle.
Oh, sure, the terrorists/bank robbers/secret enemy operatives are going to shoot me first. Is it rational to make that the big concern when the lazy criminal looking for an easy steak is much more common?
How about it's not just about you? When people that I care about are out in public I like the concept that the 'terrorists/bank robbers/secret enemy operatives' have to factor that since
N% of the population is armed at any given time then there are probably
N/100*Crowd guns in the bank/movie theater/school, and
they don't know who has them. Therefore the concept of concealed carry created a deterrent effect even when I'm not present, even for people who aren't themselves armed. Same as passing a nondescript Crown Vic on the highway slows you down because it might be a cop.
Further, while "Fine, let them shoot at me first" is a great hairy chested he-man, cowboyed up, John Wayne in True Grit, Dirty Harry would be proud type statement, when it comes to the practical consideration of being in a life and death struggle, it's fundamentally unsound. If a fight has to come, the sensible man wants that fight as unfair as possible, with as much advantage as possible stacked on his side. That gives you, and those you're trying to protect an increased chance of survival, which is not just a point, it's the only valid consideration. Bravado and style points only count in Europe. To give up the advantage of suprise, to assume that your opponent will be the common and easily scared "lazy criminal" as opposed to a worthy adversary is exactly how you lose fights in the real world. While we're at it, why not assume you don't need reloads or that a .25ACP on the hip will make you gristley (gristly?) enough to scare off the lazy criminals?