I agree, but in terms of all the people of time, we may well be in a minority. The general opinion seems to have been that book burning and censorship were positive duties of the authorities, from Plato to Boston to Girl Scouts collecting and burning the awful, 'orrible comic books of the 40's. (They'd faint if they saw manga.)
I guess we can look down on Washington and Jefferson for having slaves, or we can be grateful that little by little Christians saw that slavery was fundamentally intolerable. Half empty/ half full.
I do not dispute the points you raise - only that having "burned" books, it is not credible for the Catholic Church to then claim that the church has always everywhere believed thus and so.