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Unclean doesn't always mean "dirty". A lot of things that are considered unclean by different religions are considered so because they're spiritually unclean, rather than literally filthy. Historical riligious objections to pork are probably because of human-transmissible parasites and disease like trichinosis, which aren't as much of a concern anymore.

Pigs were kept near to people and were a vector for disease because they share similar biology to us. They weren't unclean because they didn't wash their hands or something stupid. They were unclean because they made people sick because of they way we kept them after domestication.

Using 1000s of years of religion as a source

Calling a primary source just an anecdote

Okay.