Here's the repsonse from Eugene Volokh, noted professor of law at UCLA and quite a voice for libertarians.
The Volokh Conspiracy » Police Searching for Bank Robber Stop All Cars at Intersection, Handcuff Drivers, Search Cars
Interesting read by Vlolkh. Question: Could it be argued that if one is armed, it is reasonable to believe that one is presently dangerous as well, even though the one is legally armed? Think of how we are conditioned by the warning signage all around us.
"Danger, high voltage" "Danger, propane storage here" "Danger, Calcium Chloride", etc...
It would seem that the mindset is that if something has the potential to affect in a negative or harmful way, it is reasonable to believe it presents a danger(presently dangerous). If that is the accepted mindset, one does not have to be armed to have the potential to affect in a negative or harmful way and presumed dangerous.
This seems to be the perspective of those that would make a MWAG call or favor cc over oc as to not upset the masses. It would also explain many of the negative interactions between LE and civilians. In this case, all at that intersection had the potential to be dangerous and therefore were presumed dangerous until proven otherwise.
Someone please tell me this is not the case and that we are not hopelessly bereft of our rights and personal freedoms...