Conclusion: the US government does not respect private property and the non-initiation of force. It only partially respects those things.
Nevertheless, under our Constitution, - government (and anyone else) should be powerless to take your guns away from you on the way to or from work.
Any attempt to disarm you by force is illegal and unconstitutional, and you have the right to defend yourself from it. Leaving your gun in a locked vehicle while at work is, -- as you admit, -- an "actual inalienable human right".
I have an absolute right to keep you off my property, using deadly force if necessary.
You invited me to park on your property while working. You have no right to disarm me, as you admitted just above.
No, I didn't. I invited unarmed employees to park. You aren't an unarmed employee, so you are not included in that invitation. If you attempt to force your way onto my property, I will defend myself. You can't claim that because Bob, who is unarmed, is invited, therefore I must invite you.