The idea was not banned, a book containing the author’s imaginary account of facts which could have potentially caused a law & order situation was. Those are different things.
You can debate it all you want, but in a democracy the elected government needs to take decisions keeping the wider perspective in mind.
However, its really funny getting lessons from a Pakistani on “democracy” 
Dude, I have read the book. Why dont you do the same before opening your mouth and talking about things you neither know nor understand ?