I can't help but think that the peloton as a whole is cleaner than in the past, as the risks for the average rider are too great. There is too much organization (and money) required to keep up.
I also think it is true and understood that you cannot make the leap to or remain in the upper echelons of the support without enhancement. This puts some of the younger riders at a distinct disadvantage if they start clean, but then have ambitions to challenge the likes of Alberto or Andy. You cannot podium a GT without assistance, but cannot transition to advanced performance enhancement without attracting attention.
For some reason, Sky doesn't share this fear of attracting attention, instead elevating the entire A team to GT prominence.
Froome seems no different to me than Santa, except that he has an alibi with his parasite. I wonder if the Sky recruiting policy includes screening for a semi-believable backstory to account for the new cycling reality? Or perhaps they know they are protected?