In reply to michael00693:
Thinking about it pragmatically, I'm fairly sure that the risk death/harm from lowering off a bolt you've just had a good look at is 0. More likely to catch a terminal illness from touching it, that kind of thing.
As for leaving things behind, maillons are very cheap, that's their point.
You're so much more likely to get hurt in pretty much everything else you do that day that trying to reduce the risk of lowering off a thoroughly inspected bolt is just throwing any understanding of probability out of the window.
It baffles me why some climbers want to reduce risks that are already tiny down to literally zero rather than essentially zero. Fine, it makes no odds to me, but I'm quite scared of the dangerous stuff I do, but quite relaxed about abbing off a single sling, lowering off a bolt, etc, where the chance of it going wrong are vanishingly small. Just my perspective: I think "what are the chances" and take it from there. Same reason I don't buy lottery tickets.