This pic in the meme was taken in 1915-1919 in San Diego. I bet they really let these kids go at it for a while before laughing so hard that they had to break them up.
As for Atlanta, that's f**ked up. If it was one of my kids, there would be a few less teachers/daycare employees in this world. It's one thing to get your kid into martial arts, but actual fighting for adult's entertainment is low. I hoped that daycare got sued into non existence. :{