"But our system at least makes these things aberrations and provides dissenters a way to rectify the problems in the courts."

What a lot of people don't get when they try to tu quoque US/Canada/etc on particular events is that their protection of essential liberties is defense in depth.

If a book was banned:

- due process means that this incident can be taken to court

- freedom of press means the mass media can inform others of what has happened

- freedom of speech means you can raise awareness about the banning and denounce the agencies responsible

- with freedom of assembly, those who want the ban overturned can take to the streets and protest

These freedoms are mutually supportive -- abuse of any aspect would be mitigated by the presence of the rest.