Maybe they don't think they need to hide.
I was asking a cop friend a while back where he hides to give out speeding tickets. His answer: "You don't need to hide."
There are so many people doing it, you figure that the finger will never get pointed at you. Sort of like walking around not-so-nice section of a city. You know people do get mugged periodically, but you always figure it won't be you, because there are so many people for the crooks to choose from.