What irony lies beneath the ideas of morality between the people of England and Brobdingnagian

Swift's portrayal of the Brobdingnagians is actually ironic because he is actually a loyal supporter of King George. What we see here is that Swift seems to be making a statement about those things in England he doesn't support, namely, materialism and greed. He also abhors war.

In the novel, Swift compliments and admires the virtue and loyalty of the Brobdingnagian community. He sees their army and its discipline as a direct result of the country's leaders and admires the ideal that loyalty must be inspired by well deserved trust.