Re the old urine samples getting tested - wasn't there an urban myth that he'd taken EPO as part of his cancer treatment, and traces kept turning up?
Might explain his reluctance, if testing has improved.
fwiw, he probably is an arrogant selfish and maybe nasty individual. I sit in an office with people like that, nothing to do with sport.
But he survived cancer against the odds and returned to beat the best of the rest for several years - clean or not, that was an achievement.
Sometimes the emotions around drugs cloud the issues - drugs don't make you ride better per se, they enable you to train and recover better so you ride better. And until all athletes train the same way and eat the same foods, one of them will always have an "unfair" advantage over the others, somehow. If it bothers you that much, ignore it and let those that still enjoy watching the sport, knowing it's darker side, get on with it in peace.