#1  We did not see the beginning of the incident. 
#2  We don't know the prior history of boarders in that particular area -- could be an escalation of previous problems.   
#3  The FISHEYE camera lens, being held at CHEST LEVEL, and it's motion, also suggests a concealed camera carried inside something else.... definitely NOT a camera phone, and the lens does not suggest a typical camcorder......so this whole episode MAY be staged by the kids, or someone coaching them. 
#4  The officer's reaction is tied to previous 2 points as to how justified or over the top it was.  The kids were definitely in the wrong. 
#5  Checking..... Checking...... NOPE.... I've no sympathy for the skater rats in this piece.  I've seen the actions of too many of them in public areas before this to care at all about them. 
Point number 3 is my biggest issue with this one though.