What vital role do firemen play in society, according to Beatty?

From the text:

And so when houses were finally fireproofed completely, all over the world (you were correct in your assumption the other night) there was no longer need of firemen for the old purposes. They were given the new job, as custodians of our peace of mind, the focus of our understandable and rightful dread of being inferior; official censors, judges, and executors. That's you, Montag, and that's me."