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Description of Appeal to Common Practice
The Appeal to Common Practice is a fallacy with the following structure:
X is a common action.
Therefore X is correct/moral/justified/reasonable, etc.
The basic idea behind the fallacy is that the fact that most people do X is used as "evidence" to support the action or practice. It is a fallacy because the mere fact that most people do something does not make it correct, moral, justified, or reasonable.
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So, while a common practice could be correct/moral/justified/reasonable, etc, simply stating something has always been done so it must be correct/moral/justified/reasonable, etc, is a logically fallacious argument.
Are the rules regarding safety issues (e.g. OSHA, USDA and FDA) an "appeal to common practice"? No. Because we have rules which dictate safety and conditions for a business - which a business owner signs up for when they obtain a license to operate.
But why should anyone have to give up their rights in order to freely exchange products or services to willing buyers? Why should you be FORCED to give away your rights in order to make a living? Once again I am not saying that OSHA, USDA and FDA are not effective (they may or may not be), merely that they are immoral.
In addition you cannot refuse access because you don't like the person or whom they work for (e.g. USDA inspectors, fire marshal, health inspector, etc)? Safety comes into play, the safety of your customer/consumer, and they do have the right to be safe and healthy.
If people do not believe your business is safe then they have every right not to purchase products from you.
Anyhow, maybe you want to refuse access to only specific customers? Maybe you want to refuse service to specific customers? Your position has no standing without specifics as me showing one case of "effective" can negate your entire specious position.
I wouldn't refuse to do business with anyone who had money, but I would not want the government to force people into doing business with me if they didn't want to because of my race, religion, hair style, height, gender, the fact that I OC, et cetera. The only moral way to hurt a business for doing something you don't like is to stop buying from that business, not use a proxy to put a gun to their head and say "do as we like or else!"