It's all about money. The American sprinters are apparently protected by the US "Federation". The doped E. Africans are protected by location and governments that see winning as a national imperative, like the Chinese. I should add that the US and its sprinters and the E. Africans are also protected by an IAAF that has worked itself into a corner due to its inaction when it should have done something. Now, we see the occasional gotcha! Most people caught on drugs are by accident anyway, a doctor's screw up.
With Lagat turning up positive, I'm sure many Europeans are nodding their heads, or have had their eyes opened.