Yeah but most of the evidence isn't even from cooperating offenders according to reports, but rather records. Bosch kept records of everything he did regarding his clients, just in case something like this happened and, well, it happened. He has legitimate documentation and supposedly even phone recordings proving all of these allegations. If it walks like a duck and quacks like a duck....
I think this is a fair bit of hyperbole. Palmeiro got a GG on a year he played 1/3 of a season. Everything Greg Maddux threw that was even near the strike zone was a strike, and for Barry Bonds, anything that wasn't middle-middle was a ball. Were the Orioles, Braves and Giants also above the rules of baseball? The NY media helps make some of these players' reputations, but come on.