IMO, this kind of "in your face" demonstration does more harm than good compared to the occasional non-chalant appearance of a sidearm. In this political environment, it will only take one insane goofball to get the law changed to banning open carry entirely. Then what will they do?
Further, although they are training law-enforcement in the law (which is a good thing), from the perspective of the LEO, these groups are using the law to throw their weight around. They are thus alienating individual LEOs even further than they already are. These activists need to develop the kind of patient persistence that it takes to win in an culture like this one or they will have taken us a giant step backwards.
From what I've seen, the individual cases in which one guy is arrested for legal carry in what would appear to the average person to be reasonable circumstances and purposes do more good for this cause than this sort of public demonstration.
Then they’ll sue under Heller.