OK, dumbs**t, I'll explain it to you:
Fleeing from a routine traffic stop is usually associated with already having committed a felony, and the felon knowing that he's about to get popped for same.
Pointing a firearm-sized object at somebody in an isoceles shooting stance is assault.
Most jurisdictions in the United States have denied their police their little death dealing joy rides by this time.
Most jurisdictions in the United States have serious crime problems and refuse to solve them.
My law enforcement friends, and I have many of them having been in the business for many years, admit that they love the chase.
Guys who wear "law enforcement" outfits at the local gay S&M bar are not really in law enforcement.
Unfortunately for this poor guy, he chose the wrong place to drive erratically and then flee for whatever reason: past due child support, no license, no insurance, parking tickets, etc..
Yeah, how about that s**t? One's actions generally have consequences, eh?
Once again, real police work means getting the license plate number and arresting the man when he doesn't expect it and no harm is presented to himself or other civilians.
Instead, you try to do an arrest in the guy's home, which is his castle. "Have fun storming the castle!"
The British do it all of the time, but it's not cowboy enough for American cops.
The British, because of gun-control laws, don't have to worry about the point I just brought up.
We would rather kill innocents than properly arrest and proportionately punish the guilty.
Get this straight: he was not innocent.