You absolutely are entitled to have your own opinion, as is everyone else. This is only a discussion about principles and methods to defend ones self. I may be challenging your point of view, only as a means to get you to rationalize your position. In the process, you may challenge my position, and I will have to think it through more throughly. This is where learning can occur. The process only makes us better. The discussion could also be beneficial to others reading our discussion as well.
To continue the discussion, I brought up Bundy as one example of a high level predator, who was a master of concealment. Most criminals are masters of concealment. They have been practicing concealment from a young age. Hiding drugs from their mom, or weapons from school officials, to hiding intentions or evidence from a criminal investigation. They will be concealing there tools, intention, and ability right up until they are in a position of advantage to maximize success and achieve their goals. They might not be thinking about it in the sophisticated manner I’m presenting, but they are doing it.
We can do the same thing. If you are a law abiding gun toter, the “would be hold up artist” will have the element of surprise. My goal is to take that back from him. By allowing him to underestimate me, I have regained the ability to decide the outcome. I can comply, or fake comply until I can exit the situation or position myself to rapidly escalate to a higher level of violence and win the fight. If Im pumping gas, and the bad guy sees a gun on my hip, and he’s not deterred by that, then I’m in a gunfight before I even had a chance to orient myself to the situation. I could be in a gunfight before I even got my gun out of the holster because I have completely givin up the element of surprise.
As to cops being a deterrent, they aren’t deterrents only because they are openly displaying a gun. They are a deterrent because they will continue to press the fight until the suspect is either dead or in custody. They have a different mission and different tools to accomplish it then we do. Even if the bad guy kills the first officer, more will be coming, and they won’t stop coming until he’s dead or caught. They will be coming with armor, rifles, and even a bomb robot in the case of the Dallas shooter. They have the ability to escalate to and overwhelming level of violence that private citizens do not, and that is where their deterrence comes from.