Please take notice, that any regulation that has the effect of eliminating the right and power of individuals on campus to defend themselves against violent threats implies the assumption of a positive duty to protect. Without special regulation, the law of Virginia applies to everyone, employees, students, and visitors. And ordinarily, the University has no duty to protect anyone, even as "invitees", since it is not an insurer of personal safety.
However, actively eliminating a person's ability to defend himself from violent crime places him at the mercy of predatory criminals, and necessitates the implication of the assumption of a duty to be on guard all the time, for each individual, in order to guarantee that no one on campus is subjected to violence.
Regardless of whether or not the school will be safer or less safe if persons lawfully entitled to do so are in possession of defensive weapons, one thing is sure: the University will have assumed liability for a guarantee of safety for each and every person on campus, regardless of status.