Like I said, sorry you can't think beyond such simple black and white terms. There are garbage parents of all political ideologies, and if you really understood the issue, you would know it has nothing to do with that. Its the fact that smartphones are designed to be as stimulating and addicting as possible, and society at large thinks nothing of giving children unrestricted access to them.
Here's a device that is more advanced and powerful than anything humans have had access to for virtually all of human history. They're specifically designed to be as addictive as possible, and use advanced artificial intelligence to capture your attention, regardless of what interests you. You can see the worst of humanity in high definition, the most depraved acts of sex that most people would never engage in, the most horrific violence one can imagine, and the thoughts of all sorts of absolutely insane, terrible, or just plain moronic people in seconds. And what do we do with that technology? Give it to every child in America.
Seriously, talk to some teachers about this. Kids have always had a short attention span, but its gotten orders of magnitude worse, and that is a direct result of the constant stimulation you get from staring at smartphone for hours on end.