Frankly this "purity" of the game ******** is annoying. When has the game ever been truly "pure"? If laws are broken, there should be consequences. If MLB rules are broken there should be consequences as well. But personally I've had it with the "purity" rhetoric.
In terms of PED's or any other immoral, illegal or just plain "not nice" behavior, is anything pure? Is football pure? Basketball? Cycling? Doubt it.
There are much more important "impurities" to be concerned about...for instance:
Are politics pure? Is our court system pure? Is Corporate America pure? The impurities within those systems mean a hell of a lot more than baseball's ills, IMO, but aren't necessarily viewed that way by much of our society.
The thought that baseball should be held to some higher standard than other walks of life is ridiculous. If fans don't like the impurity, don't attend/watch or purchase anything baseball related.