jones
It is against the clear 'public policy' of the 2nd Amendment to unreasonably require your employees to strip their vehicle of arms before parking in the lot provided them.
Because that's what we do in a common law system. You are advocating a novel legal position- you are claiming that exercising one's right to regulate whether firearms come onto one's property violates public policy. Other than your opinion, what legal basis do you have for this claim?
And don't say "the Constitution." The only place in the Constitution where you could find a right to bring firearms onto others' property is in the infamous penumbra.
The clear words of the 2nd support the peoples position. - Our rights to keep & bear arms shall not be infringed.
And courts have ruled in hundreds, if not thousands, of cases that the Constitutional prohibitions against infringements of rights applies to government action only. And, of course, SCOTUS has never actually ruled on whether the 2nd Amendment recognizes an individual right to bear arms, but that's a discussion for a different day.