That's only for really obvious cases. Part of the problem is that a corporation can effectively distribute liability across different people/groups, so no single individual can have a really good idea, or is even aware of what's happening collectively, to facilitate bad behavior, so to speak.

Doing this allows them to effectively engage in the same bad behavior an individual can, but without the risk associated with a single individual doing all of those things themselves. It also may allow them to scale better too. :/