It's impossible to believe because we know people who say that, and we know that their fundamental belief is that rules exist in two ways: 1) to protect and serve a certain class, without binding them, and 2) to bind the other class, without protecting the other class.
This is not a new phenomenon, the only thing that changes is the terms used to signal the meaning.
>>epista+(OP)
That is extremely flawed logic. It is logically equivalent to "We know there are counterfeit dollars, therefore there cannot be real ones."
Sure, there are phonies. Therefore it is impossible to believe that anyone is genuine? No.