I don't claim knowledge. Apart from the fact that I do not know any Jew. But I doubt that knowing Jews is something that needs to be guided by epistemology. Maybe I could to a party and see if I can epistemologically be introduced to one,
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The rest is just trivial applications of the laws of logic. There is no need to use our brains to interpret, or to do any useless philosophy about that. Just simple, straightforward, and easy moves that lead us to an inescapable conclusion, under the premise of applicability of those rules.
Your knowledge, and how we know things, and the rest of your philosophy, is totally irrelevant, since we are operating within the framework and rules of very well defined rules.
Your problem is that your skepticism cannot be applied universally, without being absurd, self defeating, or both.
Ciao
- viole