Over the past few weeks, hundreds of thousands of students returned to college life at schools across the United States. If their experience is anything like mine - and I assume it is - these students were greeted with an email from the campus police reminding them not to roam the grounds after-hours, and that if they must, to be sure to walk "with a sense of purpose and determination." These curt messages are meant to help reduce crimes on campus, and yet many students will still receive reports of armed robberies either on campus or within spitting distance of it.