You mean they are openly going to steal more copyrighted material that they weren’t able to find on Pirate Bay. Shouldn’t this mean copyright is no longer valid anymore?
I don't understand this point of view. They buy the book, they use it for training. When you read a book, you use it to train your brain. Is that copyright infringement?
Downloading from Pirate Bay is indeed theft, someone put the scan of the book online, you download it without paying, the author and publisher of the book do not get any royalties. Very different situation.