The Kid just rages for a while. He knows it's a fool's errand to try to rage forever. He's smarter than that. The Kid has already seen one Calamity and that's enough for a lifetime.
Come December 15, The Kid figured it'd be best for everyone if Bastion weren't priced so low anymore. "Just $3 is ridiculous," he thought. "Best to knock that back up to $15." Again, they can't rage forever. They might die trying.
The Kid didn't feel bad, either. They had their chance. The ground had already come to life before their very eyes. Now, The Kid was ripping it out from underneath their feet.