I noted that none of the employers that are pushing for the grab have offered to hire armed guards to escort their help to and from work.
The period of time spent traveling to and from work is not being discussed here; the employee has every right to carry a loaded gun in their car during that period of time. The discussion centers around the period of time from the time when the employee enters company property (the parking lot) and the time they exit company property (same parking lot).
If the employees wish to both be armed in order to defend themselves during the period of time spent traveling to and from work, and continue to work for their employer, they can park off the premises; having never entered the private property of their employer, they are not subject to his rules regarding weapons on their property.
During the period of time that they are in the building and being paid, the employer assumes responsibility for the safety of the work place, as evidenced by the many lawsuits that follow all work place shootings in the nation.