> You turn it off and they all go away...
They disappear to you, but not to all of the other people who you share a society with who are still staring at their little boxes. And, for better or worse, you still have to live in a world with and share elections with those people too.
I agree, completely, that it's good to get offline. But the pervasive societal effects of extremely online psychology can't be solved simply by opting oneself out of the game.
To push back on your last point, I truly believe that yes, they can.
One great failure of the Internet was taking the lonely crazies and putting them in the position of building their own community online. Unable to moderate their thoughts by interacting with normal people, now feeding off one another's neuroticism, and spreading it.