The good news is that there are many things you can do to ensure your safety. For instance, avoid getting tipsy at the terminal. It may sound like a good idea, but in some cases it calls for danger. If you feel like someone is following you, ask airport security for an escort.
Criminals could be anywhere; they usually blend in and make it hard for you to spot them out. Make sure you always do your best to blend in with the crowd and you keep your personal belongings with you at all times.