Blocking access to pages from countries where the court order was issued seems entirely reasonable to me. GitHub does the same[1].
The censorship here is the responsibility of the Turkish government, not Facebook. It's supposedly a democratic country so maybe even represents the will of the people living there.
And anyway, when social sites block "objectionable" pages on their own or under criticism, but with no involvement of the legal system, anyone who complains about censorship is quickly shut down with arguments that it's a private company under no obligation to protect free speech. Why expect them to defy sovereign states when they usually can't handle a little outrage on Twitter?