With violent crime continuing to plague American cities, the time has come for truly radical measures. Here are seven ideas for extreme changes to make our cities safer: Have highly trained guys with guns patrol dangerous parts of the city to protect innocent people: They could even wear like a badge so people know who they are. Take the violent people you arrest and keep them in some sort of building away from other people: It's crazy, but it just might work. If someone gets arrested a dozen times, they actually have to stay in the building away from...