Yes, when JC Penney was discovered to have purchased links through the actions of a third-party, and said hey, it was the contractors fault, Google immediately say "Oh, that's OK, no reason to penalize you."
Oh, wait. They didn't. They slapped a ranking penalty on the company, because ultimately it was JC Penney's responsibility.
Google did participate in a blog for payola situation. The fact that it employed third parties that got it involved in that doesn't magically excuse it from potential penalties.
This wasn't some "rogue" contractor that just did whatever it wanted. This was an agency Google hired, which in turn worked with another agency, that ran this campaign. These companies were engaged by Google.
Did Google expect this type of mess? No. Should Google have been watching for it? Absolutely. Either no one at Google bothered to fully examine the final and promised work product or they did and were dumb enough to let this go forward. Neither speaks well about this case.
And to date, I still haven't gotten Google or the agency to provide more specifics about what was expected or promised. That generally isn't a positive sign.
I think someone at Google got a pitch about doing some viral blogging thing to promote Chrome. They probably decided cool, go for it. They probably didn't examine exactly what was going to happen. They almost certainly didn't plan to buy links or have garbage content be produced. There almost certainly wasn't some evil plot to do all this.
But that's not the point. The point is that this did happen, by a company that when others do this, passes out penalties against them, regardless of the excuses. That's why it's an important story, and I'm sorry that's lost on you. It's not lost on many other people.
Including Google, by the way. That's why Google's own spam team has penalized Google Chrome's page.