I also think you underestimate the difference in someone's life not being forced to drink from a different water fountain because people viewed you as disgusting and sub-human. They weren't even allowed to eat at the same tables, in many places, but you guys are questioning whether it had a positive economic impact on their lives? It's not only ignorant but it's insulting to anyone who had to live through it.
Trust me, that was the single most important piece of legislation for a black person in the US, outside of emancipation.
We're talking about very specific things- being denied services because you were black. They were marching and protesting because they had to sit in the back of the bus, we're denied restaurants and hotels when they traveled and had to drink from different water fountains because the racist whites could associate with whomever they wanted.