Also, remember that they have a legally binding fiduciary duty to their shareholders to maximize shareholder value. If they know they can pay (made up numbers)

Also, remember that they have a legally binding fiduciary duty to their shareholders to maximize shareholder value. If they know they can pay (made up numbers) 5% effective tax instead of 20% tax, they are obligated to. The proper solution instead of raiding these firms, is to fix the tax laws that make this possible in the first place.