It’s an infinitely copyable book with it’s source material thousands of miles away outside of the local country. There is no potential for this to totally wipe out the literature. No one is being harmed by the burning of said literature, therefore it’s a peaceful form of protest.
Trying to stop peaceful protest isn’t something you can pick and choose, you are either ok with it or you’re not. Deciding what is and isn’t ok to protest about means you don’t actually believe in the freedom of protest.