Do you not care about trying to make the world as just as one can? Maybe if your brother was the top ranked clean rider in one of those TdFs that Lance won, you would have a stronger opinion on whether it's important or not?
An agenda to "prove" something you want to be true, whether or it is or not, is many things, but it is not "just."
It's about far more than just one cyclist who may or may not have doped.