We need to look at FACTS. Facts are :
1- Mathew Kisorio, Rita Jeptoo, Jemima Sumgong, Kipyegon Bett, maybe Asbel Kiprop, ran fast taking EPO. This is not opinion, but FACT.
2- But they ran FASTER when FAR from the certainty of doping. NEVER those athletes, when caught for doping, were close their PB. This is another FACT.
3- People can think they were already doped when able to run their PB. Maybe yes, maybe not, because is not a FACT, but an OPINION. And it's not correct that people, for corroborating their belief, make OPINIONS becoming FACTS.
4- Many athletes were able to run at the level of WR clean. This is another FACT, that people obsessed by the idea of doping consider opinion only. Coaches, and athletes themselves, know that their clean performances were a FACT, but of course there is no proof of this, like there is no proof that somebody honest is honest, because the justice has to prove that you ARE NOT HONEST, not that you are honest. Similary, people has to prove that some WR holder, NEVER caught for doping, was doped. while, instead, ask "which proof do you have they were clean ?". This is clearly a distorsion of a normal and legit way of thinking.
5- When somebody asks "if doping doesn't work, why so many athletes take PEDs", he doesn't understand the confusion between "scientific doping" (something used in rich sports, or in team sports, where there is a team organization) with the individual doping of some athlete, many times without real coach, and without any real knowledge about the argument.
These athletes take some doping (when of their own will) BELIEVING in the effect, and they believe not on scientific bases, BUT BECAUSE THEY READ EVERYDAY ABOUT THE AMAZING EFFECTS OF PEDS, everytime overestimating the possibilities of improvement (when really there is some effect). So, the FACT that many athletes, of every level, take doping, doesn't demonstrate that doping can work.
6- To speak of doping, in general way, is something useless. Thinking that EPO works at the level of athletes training with volume of 200 or more km per week, at the intensity they use, because Conte (who NEVER doped one athlete of endurance) says that the most part of athletes are doped, is to give credit to somebody who NEVER faced the problem.
Because it's difficult to know the REAL effects of every medicine on a performance, the list of WADA includes every medicine that COULD HAVE some effect, also if not really known. For example, everybody knows that diuretics don't have any direct effect on a performance, however if some athletes takes a diuretic because needs the medicine for its real goal (for example, the Furosemid, that now I know very well because was given to my brother in law for reducing his ascites before a transplant of liver), can be banned because that medicine "could cover some other doping".
So, in too many cases there is NO CLEAR EFFECT on the performance, but the medicine is in the list because "maybe could help the performance".
7- I can give the example of Meldonium. In this case, the decision of WADA was the same of people thinking "if doesn't work, why so many athletes can use ?". Nobody, in WADA, knew what Meldonium was. During the European Games in Baku (2015), almost 500 participants, in several different disciplines, were found with that substance in the urine. So, WADA started to think "if so many athletes use Meldonium, this medicine MUST HAVE some effect", and decided to put in the list starting from 1st Jan 2016. Everybody remember the case of Sharapova (tennis), but after, in the list of athletes using Meldonium, we could find marathon runners, runners of 1500m, swimmers at the level of WR in frogstyle, volley players, basket players, wrestlers, fencers and champions of archery and shooting : so, a magic doping giving advantages to athletes running 42 km, and to athletes who had to stay completely motionless.
8- Personally, I'm favorable to ban EVERYBODY using any kind of medicine, when in good health, BECAUSE WE HAVE TO FIGHT THIS WRONG MENTALITY, and of course every athlete, in every sport, when in perfect health wants to use some medicine, THIS IS CLEARLY BECAUSE HOPES TO HAVE SOME ILLEGAL ADVANTAGE (so he's again the ethic of the sport). But I can't accept the fight against doping, STARTING FROM OVERESTIMATIONS OF THE EFFECTS ON THE PERFORMANCES, BECAUSE THIS IS THE BEST WAY FOR BECOMING TESTIMONIAL FOR DOPING.
9- Last thing : somebody asks "how you can know so many things about EPO is you never used with your athletes ?".
My answer is very clear : I don't know anything about EPO, and frankly I'm not interested to know.
But I know HOW to coach top athletes till a WR (of course, depending on their talent, nobody can be a wizard able to coach a donkey for becoming a racing horse champion), in clean way, and this is the reason because I don't believe in the effects of Blood doping, at higher level of training.
So, there is big difference between me (and the coaches of top athletes, like for example Patrick Sang or Brother Colm) and the posters of "doping" in LR : they "believe" in doping, because don't know anything about the training at top level, we believe in training, because already had the opportunity to see where it's possible to arrive (speaking about myself, Patrick and Colm, we had the proof that, in clean way, it's possible to run 800m in 1'40"91, steeple in 7'53"63, marathon in 2:01:39.... only for giving some example).