I agree that facts are good the problem is when facts are revealed very asymmetrically. Let's pretend you have two candidates, one where you really only know about him from his voting record and public statements and the other where you know everything that they and their associates have ever done. My guess is that the fist candidate will be more likely to win. I think that if that asymmetry is too prevalent it gives an unfair advantage to one side and in my view that weakens the democracy.