However, I have yet to see anyone seriously suggest that the Civil Rights Act was introduced because the police were terrified that black people defying segregation laws might shoot them, or the Supreme Court ruled segregation in schools unconstitutional because it had proved unenforceable. For that matter, those Southern whites who thought their rights were being violated by "forced busing" proved equally reluctant to resort to armed confrontation. It wasn't a hot war, or even a cold war, it was a culture war.
The right to bear arms was orthogonal to the civil rights movement: it didn't prevent the original introduction of the tyranny off "Jim Crow" laws which were effectively enforced for decades, didn't influence the legislative and judicial rulings against them in the mid 20th century and couldn't even protect the movement's key figures.
Obviously we disagree, I think the RKBA allowed a lot of blacks to continue pushing by allowing them to continue living, or living longer, or limiting the degree to which they could be easily intimidated.
One thing you're not factoring in when you compare this period to the Reconstruction and Jim Crow eras is economics and technology. Everyone including blacks were much more able to afford small arms and ammo by the civil rights era, and guns were a lot more maintainable after we switched to non-corrosive primers and smokeless powder. And of course technological advances helped the economics by driving down the intrinsic costs of guns and ammo.
http://en.wikipedia.org/wiki/National_Labor_Relations_Act (the Wagner Act, even if moderated by things like the Taft–Hartley Act)
http://en.wikipedia.org/wiki/Brown_v._Board_of_Education http://en.wikipedia.org/wiki/Civil_Rights_Act_of_1964 http://en.wikipedia.org/wiki/Voting_Rights_Act_of_1965 http://en.wikipedia.org/wiki/Twenty-fourth_Amendment_to_the_... http://en.wikipedia.org/wiki/Harper_v._Virginia_Board_of_Ele...
And it's always struck me that the Civil Rights Memorial (http://en.wikipedia.org/wiki/Civil_Rights_Memorial) is most remarkable because it only has 40 names on it.
(Just the highest of highlights, I'm leaving a lot out.)