First, let me compliment you on not seizing the opportunity to have a knock-down fight with your wife over how much you love and care about her as opposed to how little she appreciates the fact that you are willing to stick around to protect her from harm.
One of her cow-erkers saw you getting into the car, and then suddenly all of them are "riled up and harassing her"? Seems as if one of her cow-erkers had a PSH moment and decided to involve the rest of the place in her hysteria.
1 - your wife is supportive because she knows you are passionate about it. But does she know specifically what you are passionate about? Is it just the exercise of a right? Is it just the message you send to those who see you that you can defend yourself better than they might be able to? Is it that as much as cops and others might want to they cannot just gang-tackle you and throw you i/under the jail? Or does she appreciate the fact that you do this in order to be able to protect her?Now my wife is supportive of my OC'ing because she knows I'm passionate about it. I'm OK dealing with anti's and any of the stigma, but she isn't as involved in guns or OC as I am and doesn't understand my reasons to oc, even though I try to explain and she is supportive, but I can tell she doesn't like when either one of us is confronted about it.
2 - you answered the question yourself: "doesn't understand my reasons to oc, even though I try to explain." See #1 above for some ideas to share with her. Embelish as desired.
3 -" I can tell she doesn't like when either one of us is confronted about it." That's pretty much how most women operate - avoiding confrontation and seeking consensus. That is not anything but an observation and a repetition of conclusions reached by rigorous scientific study. If she supports your OCing even though she does not understand why you insist on doing it (silly boy, but I love you so I'll put up with it) but is not willing to defend your doing it then IMHO she does not support your OCing - she merely puts up with it. See #1 above for some ideas to share with her. Embelish as desired.
Forget trying to flood her with facts - except for the fact that you care so much about her and her safety that you are willing to go to the extreme of OCing in order to protect her. Remind her that OCing makes it possible for you to do that without swaggering as you walk down the street with her, trying to suggest by alpha-male body language that you are big and bad and your woman is not to be mesed with (CCing). Remind her that you OC even when she is not around so you can continue to be around and be her life companion, and can support her and what she wants to do and become. In other words, tell her what does your OCing do for her without getting into a recitation of facts or arguments about rights.