What has the world come to...That upsets me tremendously that people have that type of mentality.
This is a very sticky wicket. Being trained is one thing. Being an off duty LEO is another and attempting to help in a situation you might not understand might have you attempting to subdue the good guy as opposed to the bad guy. I don't know that there is a good answer for this question or not.
It is a troubling scenario for sure.