You may not be able to stop them, but you can make it awfully difficult for them. Hey, maybe that's why parents are getting their kids into so many activities? "I'm sorry, my son cannot get bizzay with you right now. He has soccer practice. And then riding lessons, and after that it's karate and then..."
You're right, there are things put into play in everyday life, that are meant to prevent or slow things from happening, but unfortunately, things still happen. Lets see: Seed bumps designed to slow vehicles, yet people show no regard for the suspension of their vehicle and drive right over them. Bouncers at the door of clubs and bars checking IDs, yet people sneak in with fake IDs all the time. LEOs conduct radar set ups, which they do catch speeders and are a visual deterrant, yet once they leave, people go right back to speeding.