Layer Two: Functional invisibility.
We all need to practice to art of "being invisible." It is in our best interest to go our way unnoticed, both by potential predators and by the criminal justice system alike.
Whenever I travel, particularly to foreign countries, I endeavor to be the one that no one notices; no one recalls; no one remembers.
I silently slip through the radar, leaving no trace, a nameless, faceless tourist. When in any public place, I try to be clean and well groomed, but I never wear bright colors, any kind of jewelry, or anything shiny.
I smile a lot, but talk softly and as little as possible. As we say in the law enforcement business, "Courteous to everyone. Friendly to no one."
Loud talking, bright colors, Rolex watches, etc will consistently accumulate unwanted attention. On the other end of the spectrum, tattoos, poor grooming, loud and offensive language, a slovenly appearance, etc will also garner unwelcome notice.