It all goes back to keeping yourself safe. Take the same precautions as you would at home. Do not let your guard down because you are in paradise.
If you wouldn't walk in a dark area at night at home, why would you do it in Aruba? If you don't leave your doors locked at home, why would you do it in Aruba?
I live in a pretty quiet semi-rural community here in the U.S. and we have jewelry store hold ups, bank hold ups, murders...
criminals don't take time off from committing their deeds here in my small town, I wouldn't expect it to be any different in NJ, Puerto Rico, London or Aruba.
I still tell people that if you wanted to travel and REALLY feel uncomfortable you should have gone to Panama during Noriega's reign. Soldiers with loaded rifles on every street corner in Colon! Makes a single girl traveling alone do some serious thinking.
Aruba has a LONG way to go to become unsafe.