Jim, your point "If you don't like or understand these singers, then you don't like or understand our song traditions and you're better off coming to terms with it and going elsewhere for your fix" comes across as "If you don't like source singers then get out of folk music".

Surely that is not what you mean is it? There are more revival and contemporary performers who perform traditional style material than there are source singers. Can we not like one aspect of folk music more than another?