The history of philosophy is that of geniuses getting so close . . . but missing the mark.
It is not for nothing that I am apt to say appreciative things about Jeremy Bentham but not William Godwin. Is Godwin uninteresting? Never, on occasion, correct? Irrelevant. It is merely that making sense of Bentham and where he went both wrong and right is much more edifying.
Thus, often we must look for truth, but keep a special eye out for the interesting and profitable mistakes, even blunders.
The two most interesting failures in political philosophy, in the last two centuries? Herbert Spencer and John Rawls. I am not sure anyone else comes even close.
The errors of great men are venerable because they are more profitable than the truths of little men. — Friedrich Nietzsche