There are no pure and totally reliable sources of information but suppose we could somehow 'debias' and purify an existing source. Suppose we then listened only to it and ignored all the other sources.

We could still be led astray because it would generate errors from time to time due to the fact that we are all fallible. And these errors would be harder to spot because we would be ignoring sources of countervailing ideas.

There is no substitute for reading critically. If we take responsibility and read critically we can learn things even from flaky or fake sources.