In "A Modest Proposal," Swift tries to be (and succeeds at being) shocking and outrageous in his suggestions and statements. For instance, he suggests that there are individuals in Ireland that would be properly used for food. I hope my answer has come to your help. God bless and have a nice day ahead!
"The R-pe of the Lock" is an example of a Horatian satire. The purpose of Horatian satires is mostly to entertain and mock in a funny way. It focuses on the peculiarities of human behaviour, particularly when these seem nonsensical. It has not desire to provide social criticism or to motivate social change.
On the other hand, "A Modest Proposal" is an example of Juvenalian satire. This type of writing can also be humorous, however, its main objective is to criticize society. It is mostly led by indignation or outrage at a particular injustice. In the case of Swift, the injustice was the treatment of poor Irish people.
Someone who is eccentric means they have unusual or odd behavior, this then relates to the origin of the word which is egocentric meaning self centered. This then also goes on to relate to "center" because a person is "self centered" or egocentric.
The case of man versus nature conflict can be seen/ found in the sentence "What perils that tangle of trees and underbrush might hold for him did not concern Rainsford just then." This sentence is after Rainsford escaped to the forest, eluding the Colonel.