How is it more ethical if you don't pay for the product and no money goes to the author? Writers always say that preorders and direct purchases really matter. Of course DRM is bad, but why is piracy ethical in this case?
We have been living millenia without DRM protection of books so I would wager the justification of their necessity is dubious at best.
I 100% always pay for books available without DRM such as from No Starch Press. I encourage any authors reading to consider similarly ethical publishers.