There's a difference between what the law says they can and can't do, and what the forces of capital are set up to encourage them to do. The law may say you can't avoid costly waste disposal by dumping it into the rainforest, but the incentive (ie the profit motive) is there to skirt as close to breaking the law, and often blowing right past it.

I mean I don't think I even need to give examples of corporations breaking the law because they thought they could get away with it. Corporations, like any group of people, can fail to see the big picture. Short term profits for the risk of a big slap on the wrist is a gamble a lot of companies take.