My wife works at a public Junior High School. I believe I do know the state of Public Schools.
The girl didn't have a weapon, the girl didn't make physical threats. The girl was just performing an attention grabbing sit-in. Why was a resource officer required to arrest her? And if she didn't need to be arrested, the resource officer shouldn't have been called.
School Resource Officers are not the principal's behavior-enforcing 'muscle.' They are there to protect the safety of the students and staff.
You may know the state of your public schools in particular, but show no awareness of the state of public schools in general.