Capturing the guy in the car with the electronic fob sounds like a movie gag, something Paul Blart would do.
Breaking side window glass, like most things, is not hard if you know what to do. But if you don't, you can knock your self silly trying to do it.
And yes you can cut yourself on the glass pieces from side windows, but they do break up rather nicely into very small chunks that are not terribly lethal. I have treated a few car accident victims who have been scratched by the side (and windshield) glass -- some of them found it a bit painful, but really they were only surface scratches. The force of smacking your head on the side or windshied glass is what causes problems.
If I were faced with the prospect of having to explain to my murderous/violent/psycho cellmates that I was captured by an electronic key fob or facing the risk of minor abrasions from going out the broken side window, I know what I would choose...
