While it is true that corporations act in their own interests, they simply cannot act without someone actually acting. Even if it is run by computers, someone has to direct them to respond in specific ways. The entire idea of a corporation being a person is that it needs to be an entity separate from the owners who take no control in it's operations.
This is why referring to a corporation as an entity is proper in some respects but when it violates a law, it is actually those inside it that violate the law. No corporation can exist if it's policy is to violate the law or to cause a person's death (unless you are some kind of mercenary or something). If a corporation does something and people die, it is people inside the corporation that did something and people died. Sometimes nothing happens and a defect causes the death (like a weld in a tank corroding away due to some unseen and unknown impurities in the welding rod and the resulting rupture releases poison into the air) and that would be a lot like a tree falling and killing people. You certainly can't put nature in jail nor could we sue God and get payment. There are remedies if the home owner knew the tree was about to fall and didn't take steps but that is more of an example of someone choosing to act or not act in a certain way.