FWIW. I've been that guy the OP describes. I had good reason though. I was on my way out to the boon docks to go bear hunting and I had I rarely go hunting without a side arm and always wear camo.
Idaho is an open carry state and requires no blaze orange so I could easily be mistaken for nutbag militia wannabe...
however in Idaho, unless it's a government building(post office, court house, school etc) no guns allowed signs do not carry the weight of law so even if someone has no guns allowed they can't do anything about it. they can call the cops and report a disturbance if they want but by the time they get there I'll be well on my way to run another errand or head up the mountain...
just how I look at it... your .02 may buy something different.
all guns lost in a tragic smelting accident.
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Bean counters told me I couldn't fire a man for being in a wheelchair, did it anyway. Ramps are expensive.-Cave Johnson.