You can still step outside your door right now and have your pocket picked (or the modern version, having your iPhone snatched right out of your hand while you’re talking on it). But as these 19th century-early 20th century illustrations suggest, pickpockets and muggers used to be the pressing concern of the day.
There have been 13 robberies reported in Central Park so far in 2013. But in most of them the robber presumably takes stuff. That's how that works, right?