Grand Theft Auto games aren't immensely challenging - the game is designed to basically serve up an entire city as your own personal playground, so long as you don't mind stealing cars all the time and murdering every person in sight. But some people like to add a little challenge spice to the GTA stew by doing the impossible - actually following the law. No stealing cars, no murdering civilians, and - hell - even obey the traffic lights. It ain't always easy, but you'll appreciate what you got a whole lot more when you aren't punching a guy out of his own car to get it.
I scream, you scream, we all scream for zombies.
When duty calls, the only way to answer is "F*CK!"