NOTHING you say begins to address my point: nobody has a right to form a union on my private property period.
Of course, they “rate some consideration”: a market wage and anything else agreed to in a conversation free of government coercion, and it is only government coercion that allows unions to exist.
I don’t know if unions MUST be adversarial, I only know that they ALWAYS are, and they don’t care about my business; they think I’m rich and I’m stealing from them, and they want to use government force to seize my property. THAT is the UNDENIABLE LONG HISTORY of unions.
ANYBODY has a right to form a union on your private property. The right to free association doesn't stop at your fence.
I agree that you should also have the right to fire anyone who tries to form a union in your shop. And those employees have a right to picket you as a tyrant and a bully.
Your paranoia about government and unions has some basis in fact, but is so over-the-top as to be pathological.