The wars.. "You gotta vote, your grandfather fought for your right to vote". Reinforced by 'winning'. The good won "hurrah to the victors, celebrate our collective goodness and righteousness."
Meanwhile the disenfranchised shell shocked returning soldiers at best became meek and let the government and their sons and daughters walk all over them. Their sons and daughters being the youth of the sixties.
The success and celebration of the 50s and 60s, the best years of western civilisation I am told. Many benchmarks for life were set then, a great deal of programming, partly self inflicted I would suggest, would have happened during that time. A time of great relief and emotional connection.