What matters is to live in the present live now for every moment is now. It is your thoughts and acts of the moment that create your future. The outline of your future path already exists for you created its pattern by your past.
Ideas are only lethal if you suppress and don't discuss them. Ignorance is not bliss it's stupid. Banning books shows you don't trust your kids to think and you don't trust yourself to be able to talk to them.