The only time I ever interact with someone who has a gun is if I get pulled over while driving. Sure the risk is low, but the threat exists on every interaction, and is a big incentive for me to find ways to avoid driving.
Going to need some sort of evidence for this. Anecdotal doesn't even work here because the firearms are concealed.
To the point of cops however: All cops get a 50 state exempt conceal and carry permit for life. http://en.wikipedia.org/wiki/Law_Enforcement_Officers_Safety...
Why is it that drivers licenses, marriage licenses (both licenses to exercise privileges) covered under the full faith and credit clause, but CCW permits are not?
Also, you imply anyone with a firearm is a "threat." The USA might not be the best place for you to reside, as hoplophobia is largely futile.
(Unless, of course, you are saying that the majority of the population in countries where the police do not carry guns are all phobic, as many of them would have the same reaction.)