REASON

In Gulliver's many talks with the Houyhnhnms he tried to explain the wars that took place for religious reasons, and instead unveield how humans by themselves are not that dangerous but when they use their "reason" as a means to find excuses as opposed to alternatives to war, their power of destruction can become exponentially catastrophic. Even still, Gulliver tries to explain and defend war in the name of "civilization", and expounds on how after a country is conquered half the population is to be killed and the other half enslaved. From this the master Houyhnhnm comments that although the Yahoo he coexists with are wretched, that English Yahoo's are far worse because they exploit their reason to magnify their vices (immoral or evil habit/ practice).

side note: It is important to keep in mind that even though these are just explanations of the novel that help us understand the plot better, that these malice iniquities, are things that Swift saw in his fellow man, and are things that can still be seen today.

Money is focal point in Swift's arguement about the nature of man. He says that money is the medium in which men satisfy their vices. Through this Swift eventually circled back around into the topic of diets. It is through large sums of money that man expands their opportunities of abuse (whether it be in wars or something miniscule like their diets) with money, people are afforded the opportunity to eat "gourmet foods" (gourmet food being a symbol of lofty status or affluency) in large quantities, which causes a lifestyle diet of excess, gluttony; unhealthfulness, and in turn a diet just like the Yahoos' Gulliver encountered when he arrived to the Land of the Houyhnhnms.