Comment: You are close to understanding.

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In reply to comment: I don't understand how this (see in situ)

You are close to understanding.

The government has no authority infringing on my property i.e. who I rent to, serve food to, or sell product to. The result may be as you said "Denying service to people who affront your personal bias is an ethical question that will surely cost the business owner his business in a free market." but it is my personal choice. When a government tries to cram their alleged moral authority down someone's throat, it breeds resentment.