In the US the majority of states do not have a minimum age for arrest.
Only 21 states have a minimum age and the youngest they can arrest someone is 6 (North Carolina) then 7 in a couple of states including New York, then 8, 10, 11 and 12 for others including California.
The 6 year old was led away in zip ties because they are too small for handcuffs. They were also charged with battery due to their attack on a teacher. Just because a child is calm later does not excuse their behaviour. We do not know how many incidents like this preceeded this arrest. I don't think it is right to arrest her but I am unsure on the legalities of educational rights of students in the US and that school district.
I think we all agree that someone should be allowed to do their job without fear of being punched and kicked. Would this be different if this were a NHS worker? Or is it that it was a teacher who was assaulted, who no doubt has to still teach this child.
What "punishments" do you think can be handed out in a UK primary schools? Most children for misbehaving in class lose 5 minutes of playtime which needs to be supervised, so the staff member loses 5 minutes of their break too.
I have tried to teach a small group of children some maths work whilst telling them to please try to ignore another 9 year old in another room nearby yelling "fuck you all you bastards, I hope you fucking die let me the fuck out of this fucking room"
Luckily I have never been attacked, but primary school staff get spat in the face, broken fingers, kicked and punched. These are main stream primary schools trying to teach children with behavioural issues. It is very hard work.