Modern transportation contributed towards physical obesity. Technology became so efficient and so cheap that we became isolated from physical reality... we have to work out in order to stay physically fit.
I propose that modern communication has had a similar impact. We've been binging on the conflict-free interactions we enjoy, but we haven't been eating our veggies or working out. This is a mental "obesity epidemic".
We drive between similarly minded social gatherings. We keep contact with similarly minded people by calling them. We're in constant communication with our social groups with little time for disruptive ideas to slip in... each of us is deeply connected to our pocket of the world, but many of us are equally disconnected from the rest of the world.