The culture of hatred for those on welfare and the unemployed will cause riots and perhaps revolution when people have lost their jobs due to robots. Upper class individuals and politicians will be targets for a starving middle and lower class who will rip the country apart unless World is prepared for the reality of automation. If you do not know what automation is a good introduction would be this CGP Grey video.
Automation will spell the end of Humanity
The issue of automation is one that has come up ever more recently in my thoughts, America (and the world) are growing ever closer to the reality of true automation, but we are not prepared.