It is not. Most parents I know have seen what it does to their kids, but have zero childcare. I have a white-collar remote job and can police my kids. If I was dual-parent working class, I don't think I'd be able to pull it off. I'm glad these laws are getting on the books, so at least the peer pressure of a classroom can get to a good majority of kids.
The kid with the iPad at the restaurant is just saliency bias ("I see it everywhere!"). This is not that different from blaming parents for sending their kids to school hungry or for their kids getting abducted or some such.
Social media is a vortex with a very strong societal pull.