It's no different to the phones for toddlers at school - they can, they know how, they are just even more affected by FOMO, peer pressure and judgement than children.

The other excuses are all just cope - little Timmy will just find a way around the blocks is true. Little Timmy can also get Heroin if he really wants or just one family might offer all the kids a hit on a crack pipe but it isn't an excuse to keep a needle, pipe and some fresh gear in the living room.