How did Faber and Grangers actions either fights against or give acceptance to the burning of books?

In Ray Bradbury’s Fahrenheit 451, the main character Guy Montag first met Professor Faber in the park before start of the events in the novel. After being exposed to illegal literature, Montag is realizing that he is against what he is doing as a fireman (burning books), and he needs an ally. He finds Faber and convinces him that he is not trying to get Faber in trouble. Although Faber is on Montag’s side, he is reluctant to take major steps against the government out of fear. He ends up providing Montag with an earpiece through which they can communicate so that Montag can escape. Once he gathers his courage and assists Montag with getting out of the city, and then getting himself out of the city before it is destroyed, he has taken his first major step toward fighting against burning the books.
Granger, on the other hand, actively works to disrupt the effects of burning books, and yet even his efforts are not targeted toward the burning of the books themselves, but retaining their content. No longer a part of society, Granger leads a group of people who have left society, and together they memorize all the books they can, so that they may preserve the knowledge and ideas they contain. Once Montag has made his way safely to this group, Granger welcomes him and teaches Montag how they will do their part to keep literature alive.