What aspect of human nature does Gulliver critique through his experiences?

Gulliver critiques vanity, greed, and moral failings through his experiences by presenting various societies that embody these traits. Throughout his travels, he encounters different civilizations that reflect human weaknesses and the consequences of these flaws. For example, in Lilliput, personal ambition and petty rivalries overshadow genuine concern for the public good, highlighting the vanity of individuals. In Brobdingnag, the moral failings of humanity are emphasized by contrasting the giant's society, which is more morally upright, with the corrupted aspects of Gulliver’s own society. The portrayal of the Houyhnhnms, who represent rationality and virtue, further underlines the vices of human nature by holding a mirror to Gulliver's world, illustrating how greed and selfishness distort human interactions and society as a whole. Ultimately, these critiques lead to a profound disillusionment with humankind, as Gulliver recognizes the prevalence of these negative traits in every culture he encounters.