[SampleMan]

Agreed, with one caveat: If some nutplace shoots up the business and it can be shown that the place was chosen at least in part because the nutcase knew his targets would not be armed, the employer should be subject to liability.

Negative. You knew the rules and YOU chose to comply. Yes, decisions have consequences.

"If some nut job" should never be the employer's liability.

[piytar]

“’If some nut job’ should never be the employer’s liability.”

Yes it should if the employer makes the nutjob’s actions more likely and more likely to be more lethal. It’s similar to why you don’t let known pedophiles work in daycare centers (except in certain lib states where said pedophile’s rights trump kids’ rights not to be raped by law).

[School of Rational Thought]

"If some nut job" should never be the employer's liability.

That is exactly when it is the employer's responsibility. If they make a decision to not let employees defend themselves, that decision stands under all circumstances.