I don't understand why it's sad. Isn't it an attempt at approaching new things with an understanding of previous interactions?

Say you give a child a maraca, and s/he learns that s/he can shake the maraca to make noise. Then you hand a child a block, s/he is going to shake the block to see if it makes noise. The interesting bit and teachable moment is that these things have different features and properties and we interact with them differently, and thus we use them for different things. How does a touchscreen fall outside of that?

I say this as a recent parent who is hesitant to introduce screens and approaching the subject carefully.

Also, that video is hilarious, and it's clearly for the best that he's been pulled over.