Seriously, take another look at this video, people.LightspeedJack said:snip
It's clear that he's in the middle of the street (or something like a street), with nearly everyone else on either side of this street. The cops seem to want him out of the middle of the street.
There is one cop behind him, seemingly hoping to move the chair. He is flanked by other cops, but take note of the one to his left--or in "front" of him (audience perspective). As they try to move the chair to get him out of the road, the "front cop" is holding him steady. A few seconds later, the kid clearly dives for the ground. While "front cop" still has hands on the kid, you can see that he's being pulled by the kid's movement toward the ground, rather than driving it.
After this point, you now have a handicapped person in the middle of the road on the ground, who has made it pretty clear he does not want to go willingly. Rather than put him back in the chair and repeat the same performance again, and rather than try to pick up a fighting, angry person, it's easier just to pull him out of the middle of the road and follow up with the chair (which you can see the cop behind the chair trying to do, likely having simply forgotten that the brake is still on).
After the incident, the kid clearly uses his disability to try to claim he's "no threat," and that he was victimized. This video, when looked at critically, tells another story. He was in the middle of the road, he needed to not be, he wouldn't go willingly, and he dove when they tried to wheel him. The cops then did what got him out of the road the fastest.
The kid victimized himself. He embarrassed himself. Having CP doesn't mean he's stupid or incapable of manipulation of the circumstances.