Yep. This. Some people never put themselves in less than safe situations. Some people take calculated risks. I do things alone, as a woman, that even my family criticize me for. It is a calculated risk. I would rather live a potentially shorter life on my terms than to live a longer one where I don't get to pursue my dreams and my passions for safety reasons. I've been lucky and smart about it, but I've had some near misses.
For the record, college age men wander off on their own as well, and if you've followed the alleged smiley face killings, you'll know that drunk college guy + water = Danger, danger, Will Robinson, complete with flailing robot arms.
2,700 teenagers died in car accidents in 2010. That is a far bigger risk than murder, but people don't blame teenagers for driving. She made a choice to walk alone. In hindsight, that was probably not the best call, but it is a call that hundreds of thousands of college age women make every weekend and it end badly for very, very few.
Being a teenager and a college kid is about learning to balance fun and responsibility, risk and reward, safety and independence. It is awful that a relatively small number of them lose this battle, but we cannot wrap them in bubble wrap.