I watched the video - they DID contact the mother & she said she couldn't come till after 3. This is just insane. If I'd acted like that in kindergarten, the teacher would have put me over her knee, popped my butt, and that would have been that. I don't think I've ever seen a kid who literally needed a pop worse that this one - she worked herself into hysterics, daring the ineffective 'teachers' to stop her, and they legally couldn't. Three quick smacks would have stopped that tantrum, and traumatized her a lot less than being taken away in handcuffs.
Also, I needn't mention that my father would have killed me, probably. He had a way of just walking down the hall towards my room, popping his belt in just such a way that I never EVER behaved like this kid. I simply wouldn't dare. The world was better in some ways then..a scant 20-25 years ago.
Bingo !