Needless to say, corporate aviation passengers are somewhat different than ticketed walk-up strangers at airline ticket counters.
Corporate client passengers are usually company employes, or otherwise known individuals. I seriously doubt that a stranger would be accommodated aboard a private bizjet, irrespective of whether or not the bizjet is operated by fractional owners.
However, there is room for improvement of perimeter access at general aviation airports. Local police or private security guards should be assigned full time at large general aviation airports to help preclude theft of, or illegal access to airplanes.