This is no different than people saying TV is bad and is ruining kids (which is true to some extent if you let your kid sit in front of a TV all day) which is nothing new.
The problem is parenting.
If you let your kid spend all his time (insert "watching TV" or "using a tablet" or "playing video games" or "reading comic books" or etc etc) then you're going to have a problem.
Same thing if you let him only eat his favorite food ("mac and cheese" or "drink sodas" or etc. etc..)
Everything is about balance and variety.
My kids get a little bit of game time on the iPad, and afterwards they frequently act like a drug addict who can't get another fix. And so we explain to them, a little bit is fun, but now its time to do something else. Shortly later, they are playing lego, or kinex, or drawing, or experimenting with random crap they found around the house, or gardening, or running with the dogs, or... and with just a little guidance and interaction from mom and dad they will do most of this on their own.
The problem is not , the problem is lack of parenting.