No I don't think it's this. I think it's the advent of the internet. The internet changed everything. What you will find is that the internet is responsible for making everything look like an "overshoot."
At that time the abolishing of Racial Segregation was already old news and happened at least 5-6 decades before the internet. If this was an overshoot you would think the overshoot would've happened after Martin Luther King Jr. was shot and not on some random time period 60 years later when the internet just happens to be 2 decades old.