There's an increase in serious weight disorders from cellphone use. And people who don't sleep have serious other consequences for their health that can be associated with it. There may be as well increases in problems with their memory. And all of those things are not as sexy and don't demand as much attention as cancer, but they can be very, very important from a public health point of view.
Socialism violates at least three of the Ten Commandments: It turns government into God, it legalizes thievery and it elevates covetousness. Discussions of income inequality, after all, aren't about prosperity but about petty spite. Why should you care how much money I make, so long as you are happy?