Groverdill I think it is a great question. I find that I am far more likely to ignore behavior that might have caused me to react in the past. Your example is a good one IMO. A tap on the horn to get the attention of the knot head in front of you is one thing, laying on the horn is another. Walking away from potential trouble or avoiding it all together takes far more discipline and self-control than responding to it. So my answer is yes, I believe carrying a weapon increases our responsibility to behave civilly and maturely.
"Any fool can criticize, condemn and complain and most fools do." Benjamin Franklin