This change will increase the probability that there will be a shooting in a place where there has never been a shooting?  You are increasing the probability of danger where there has been no danger.

All but two of the mass shootings have incurred in Gun Free zones. By definition, you will be creating a Gun Free Zone which is a Target for those with a Grudge against the Government of Virginia, Mentally Ill individuals who are paranoid and delusional and terrorists whether domestic or foreign.

Why would you take a safe place and make it far less safe? This does not make sense. There is no logic or rational for this action.  There has never been an incident and under the current policy, there never will be.  Making Gun Free Zones decreases the safety level immeasurably.  If this is done, then any incident would open the government up to massive lawsuits for reducing the safety of the employees.