Why does Defarge compliment his guest for applauding the king and queen?

This is in book 2 chapter 15. The mender cheers wildly as the King and Queen pass. Defarge mutters in Madame Defarge’s ear that this the sort of peasant they need around. Defarge thinks peasants like the mender of roads will lull the Monarchy into a false sense of security. Peasants like him will convince the King and Queen that their reign will last forever; when the revolution comes, the King and Queen won't expect it at all.