Except that's not what history shows us. Economics didn't free the slaves. Guns did. Economics didn't end segregation in housing and education. Bitter, expensive litigation did.[1] Economics didn't make gay marriage legal. Waging a cultural war on homophobes until it became social suicide in most circles to be one did that.
[1] And guns when people defied the court judgments: https://en.wikipedia.org/wiki/Arkansas_National_Guard_and_th....