Perhaps those that bought his books were not Trump supporters and yet they have to "pay" as it were for his beliefs. There are a great many in the States as well as Canada who never read a book, so they as they say, could care less. The problem with a so-called principled stand is your net is so wide,,  you catch people who are actually on your side, which makes your stand meaningless. By the way we are still waiting for all those American celebrities who were moving to Canada if Trump won.