You seem to be commenting on somebody else's posts.
My view is that pure reason is a useful adjunct to approaching truth, as long as you cross check it with something outside your own ruminations. The ancient Greek philosophers thought this latter step was unnecessary and beneath them.
The scientific approach can be elucidated by use of reason, but it does rely heavily on getting empirical evidence directly from the world around us. Now obviously we cannot verify that this evidence is absolutely true in a rigorous sense. It is, however, the best we can realistically get. Valuing your own ruminations higher than this evidence is, IMHO, the height of idiocy.
That was my point.
My point is that there is no way to cross check logic without using logic. It's self-deception to think otherwise.