The part of this excerpt that is directed against a particular social class in Ireland is "..I grant this food will be somewhat dear, and therefore very proper for landlords, who, as they have already devoured most of the parents, seem to have the best title to the children..."
In this part Jonathan Swift criticizes powerful and rich people, mocking landlords for being a part of a high social class.
It is about Salem witch trials and the behavior that can result from dark desires and hidden agendas inspiard by the McCarthy hearings of the 1950's Aurther Millers play