EVEN THOUGH GULLIVER HAD DONE SO MUCH FOR THE EMPEROR OF BLEFUSCU,HE LETS HIM LEAVE HIS COUNTRY WITHOUT ANY SENSE OF GUILT?WHAT LIGHT DOES THIS THROW ON HUMAN NATURE ON GENERAL?

I think Gulliver had done a service to the Emperor of Blefuscu and that was enough. Human nature seems to thrive on debt and payment: duty and reward. Once Gulliver has done his duty, the emperor of Blfusch rewards Gulliver by letting him go. He also gives him gold, a giant picture of himself, one hundred dead oxen and three hundred dead sheep.