I pre-empted this - my argument does not apply to texts where the physical object is a major part of the historical value of the thing. No, I'm not saying to destroy one of the four remaining Magna Cartas that were meticulously copied by hand. But even if I was, we're only dealing with texts here that are irrelevant enough to have never been digitised already - we tend to digitise most things of value and so the Mona Lisa and Magna Carta would never have been part of this discussion in the first place.

I am however OK with destroying one of the remaining 50 children's books of which only 300 copies were ever printed in a small town in Ohio in the 1970s as a test run for a failed book which was subsequently never commercialised.

If you purchased the Mona Lisa (or some rare book), in this hypothetical, you can burn it.