Mostly because corporations are pretty different from people. They can own each other, buy and sell each other, split in two or be combined, etc. And they they

Mostly because corporations are pretty different from people. They can own each other, buy and sell each other, split in two or be combined, etc. And they they can deduct business expenses in ways that people can’t deduct living expenses, because we rationally recognize that corporations mostly have lower profit margins than the tax bill would be on total revenue (and some always will at any tax level).