Just remember some of the worst serial killers are good looking and charming, Ted Bundy comes to mind. The smart woman who follows her "creep" instinct might be the one who lives.
I worked with one guy who gave me serious bad vibes, and almost everyone else too. You have to wonder when...
My guess is the guy hanging out at the Walmart is homeless. He may think it is a safe place to be during the day.
When I was in high school, I had a job at the local alcohol/drug abuse center. On really nasty days, the hardcore winos would come in to get out of the rain. One of those guys...