Just my reasoning from available info, it seems NOP is not interested in clean sport per se, rather they push boundaries to compete with actual cheats, or to beat those that choose or do not have the means to push the boundaries at all. I've read nothing at this point that makes me believe there is guilt to breaking the word of the rules.
But it is obvious these folks do not care for the spirit of the sport, at lease my interpretation of the spirit of the sport. It seems large amounts of money and time have been spent by NOP to determine exact positive testing points. Push right to the limit and stop. To what gain?
How much respect would there be for this group if they spent the same time, money and effort to expose actual cheats, or help develop new testing and infrastructure to ensure clean sport? Rather, the choice has been made to win at all cost, get on a podium and sell more product.
If your thing is to just see world records every weekend, so be it. I can go to a horse track and see faster performances any day of the week. But that's not why I love this sport. If clean Americans can't compete with clean Africans because of genetics, altitude, etc... that's a bummer for a fan of American runners, but at least there is an honest baseline. Right now all this PED/obviously questionable usage is killing the sport, and to me NOP is part of this problem, guilty of actual rules being broken or not.