What is the mob's reaction to Charles's acquittal, and is this surprising?

Gabelle testifies on his behalf, as does Doctor Manette, who points out that far from being sympathetic to the English aristocratic government, that very government had tried him for his life for being a friend of France and America. Darnay is acquitted, and the crowd greets him with rapture. They lead him back to his home, holding him up in a chair. When Lucie comes to meet her freed husband, the crowd dances the Carmagnole around them. The mob's reaction is not surprising. They feed off irrational emotion. They are generally clueless about the truth.