If it is a product/software from a large company/corporation/organization that already has "fuck you" levels of money, then I feel it's way more than ethical since a few thousand people pirating their shit will absolutely not cause even the tiniest of cuts in their company for one, and because they treat their customers the same way an extreme germaphobe would treat the world record holder for dirtiest man in the world.
Same goes for any form of college/university textbooks.