A Modest Proposal- What is his claim? What are his reasons to support that claim? What are his warrants?

The literal argument is that Ireland is overpopulated because the Catholic population is reproducing too many children. Therefore, by using children as a marketable commodity (for meat and for other income-producing enterprises), the children would be less of a drain on the Irish economy and would, in fact, increase the economy. His real argument is that the English are treating the Irish so badly that they are literally cannibalizing the Irish people.