Please add to this list...
The question is, when does open carry reinforce our 2A rights?
I think the argument of open carry to "get people used to it" is a little too hopeful and prone to backfire. I know what we would like. As an analogy, everybody is comfortable walking through the kitchen and seeing an array of PERFECTLY DEADLY knives sitting in the drainboard totally unsecured. I don't think we can ever get there with respect to guns. Please tell me I am wrong.
I think that reinforcing 2A rights by open carry is subject to the test of reasonablness.
Some more analogies: Not everybody would welcome a street-legal, but obviously fast, dragster car cruising down their residential street (kids, pets and all), even if it were being operated legally. The dragster is obviously out of place and possibly a negative influence on immature minds (kids). Probably the point is to startle, or at least to show off. Or again, it is legal and within your rights to carry/wear a Christian cross into a mosque or synagogue, but it is not reasonable unless your point is to protest. I guarantee you, we DO NOT want to open carry in protest - it will not help the 2A cause among non-involved, un-suspecting voters. (Several other posters have agreed on similar matters - smart-a!! comebacks, etc.)
So, when would an un-suspecting, non-gun-rights voter be persuadable that open carry is reasonable?
1) When hiking, camping, fishing, etc. when bears, cougars, etc. may be a danger
2) After a break-down of law and order, like after a hurricane, riot, etc.
3) After a vehicle breakdown on a remote highway (esp. for women)
4) While escorting (walking) defenseless people through a "rough" part of town (Note, if you were going alone, concealed carry may be wiser, but may not)
5)
6)
Yes, I know. These options are disappointing due to remoteness or infrequency of occurance - not many people will see the open carry.
Two related points:
a) Reasonablness can be dramatically increased if two or more of us show up open-carrying, esp. if we appear not to be collaborating.
b) The reasonableness test does not mean that un-suspecting people will be free from being startled or initially suspicious upon seeing open carry. We don't care if they are initially startled, as long as we win them over shortly thereafter. The startle response is one thing we're trying to get them past.