I'm
not condoning what the deputy did, in fact,
I think he handled it completely wrong, but watch this video:
Bikers on Freeway (Memorial Day '12) : Dallas Sheriff's Dashcam Video - YouTube
These are the kind of assholes (the bikers) that were out that day being complete dick wads to law enforcement. Complete disrespect. It's no wonder the deputies/officers were a little heated already...
again, I'm not justifying taking the guy to jail for a fix-it ticket or slamming him in the car, but if you are gonna hang with a bunch of dicks, you might get treated as such.
Unfortunately, this deputy just threw more fuel in the fire for the cop-haters out there and he's probably gonna lose his job over some punk ass biker. And, the biker's probably gonna get a nice settlement check.