I guess the main issue here is, are corporations accountable for the things they do or does the accountability end with the people? Can any corporation wash the blood from their hands by giving a golden parachute to the managers who oversaw illegal actions?
You also have to be careful, though. If the Attorney General becomes such a thorn in the side of the corporation in question that they decide it's no longer worth doing business in your country because of her, a lot of people are going to lose their jobs. And one of the things that caught my attention in this story is that part of the "interference" she's screaming about is asking her why she REFUSES TO WORK OUT ANY KIND OF PLEA DEAL, despite the people around her telling her that's probably the most appropriate action to take. It sounds to me like she didn't just want to fine the company; she wanted to BREAK them, and that's what got the other high level guys asking questions.
I don't think corporations should be let off easily for breaking the law. I DO think you need to consider circumstances and what could happen if you push really hard, though; corporations have ways of making the workers and the customers feel the pain they're expected to feel. In this case, I think it would be better to fine the company and go after the now-departed executives for any crimes, not try to break the company. The latter helps nobody, except the executives (who will loot the corpse and run for it, and everyone knows it).