.... As the police explain it, this 14-year-old girl attacked the police officer first, punching him.  Of course, the video shows something slightly different.

When someone inexplicably grabs a person’s arm, it should be reasonably expected that the person will resist.  When the person whose arm is grabbed suffers from severe mental illness, one should reasonably expect a reaction, much as this child reacted in the video. What cannot be expected is for a police officer to haul off and punch her with full force, as violently as he possibly can, in retaliation for her attempt to swat him away....