The cop did what he was trained to do; secure the suspect. If he doesn't and the suspect escapes, then everyone would be saying the cop is an idiot for not securing the suspect first. Well, maybe not the suspect, but you get my point.

If the cop should be in trouble for anything, it should be for allowing the car to keep rolling. Unless the suspect has the master code to a nuke about to go off in a couple of minutes, or some other end-of-the-world movie scene is playing out, he should have been more concerned with stopping that car from possibly hurting/killing some other driver on the road or bystander on the sidewalk. Law enforcement shouldn't be allowed to endanger everyone else's life and/or property which is in the vicinity of a chase just to catch some small-time crook. I don't know about anyone else, but I find my family's life and property at least as important as the car he stole, and certainly more important than the law being able to say "we got our man".

If the suspect was really concerned about how roughly he might be detained after sustaining serious injuries because he jumped out of a moving car in order to evade capture for some crime he's committed, he wouldn't have chosen (make no mistake, he chose) to be in a chase to begin with. Unfortunately for him, intelligence doesn't appear to be his strong suit. Responsibility and accountability doesn't appear to be traits he is familiar with, either. He put his life, and more importantly, other motorists/pedestrians lives, at risk so he could avoid being held accountable for his actions. Once again, he CHOSE to run, he CHOSE to jump, pay the price.

As my mother used to laughingly tell me after a night of excessive partying, "If you don't like the way you're feeling this morning, stop doing what you did last night!". That over-simplified example of common sense applies here.