No matter how you look at it, NAU is a safe place to be. Every once in a while, there is a sexual assault, usually on South Campus, and students will feel a little spooked. Sexual assault usually consists of a homeless person yelling at a girl that she's hot. Yet, the consensus of most people seems to be that if you practice common sense, then there is nothing to worry about. Flagstaff is the "Dark Sky City," so it only makes sense not to walk by yourself if you don't have to. The blue-light phones are scattered all around campus, and NAUPD offers an escort service 24 hours a day. In addition, the on-campus police maintain a highly visible role and are constantly on the watch. Flagstaff is a very laid-back community, so very few serious problems ever arise. The residence halls have electronic access, which means that you have to swipe your ID card to enter and only residents of that building will be let into the building. Once again, practicing common sense makes the environment safer for everyone.
Flagstaff is a safe place, no doubt about it. If students are able to use their heads and not put themselves into positions where bad things could happen, then all will be just fine. There is a decent-sized homeless population, but to be honest, most of them would rather have a friendly conversation with you than beg for your money. The police maintain a good balance and are not overly strict. They are around to deal with situations, but they don't hover to the point where students feel uncomfortable. In the end, if people make smart choices and are careful about what they do, there's no reason not to feel safe or relaxed.