No, it is not necessarily more consistent. As somebody pointed "they are all doped" relays on circular logic. "They are all doped" is also the sign of heavy indoctrination, what forces you to see only what you want to see, it forces to selective arguments, selective interpretation etc.
We do not operate with perfect information, quite contrary. There are big holes in our information. The environment is not constant, but all the time changing: if somebody doped in past, it does not mean that they are doped in present. If whistleblower described situation 2005, it does not mean that his story was absolute truth, even more, it does not give us information abut situation in 2010. We just dont know. There are too many variables, unknowns, lack of information to make such absolutist statement "they are all doped".
Your position is prosecutors position, not the position of impartial and objective judge.