Why did the delegates decide not to revise the articles of confederation

Because the article of confederation was not effective and couldn't unite the New America

Explanation:

The Articles of confederation was made when the United states of America got there independence from The British. it was adopted as the First constitution of the original 13 states that made up the United states then. the delegates decided to replace it after sighting its ineffectiveness and its inability to successfully unite the American people .

The ineffectiveness of the articles of confederation was proven in various events like the Northwest ordinance, the Shay's Rebellion and other events. the need for a stronger Federal Government led to the constitutional conference which led to the replacement  of the articles of confederation. with a proper constitution

social contract theory basically says that all individuals are born equal, and provided a god given right to consent to be governed. american government is based of this

thomas hobbes and john locke said that we are selfish, individualistic, and constantly at war with each other, therefore we need to be controlled. 

government is defined as the legitimate use of force to control human behavior within territorial boundaries, here comes in hobbes and locke.

hobbes takes the part about controlling human behavior. while locke takes the part of legitimate use of force, since force is not legitimate unless there is consent of the people. 

there are basically 3 goals of the government: 1) maintain order by protecting life and property. 2) providing public goods, those which are typically not provided by the public sector, such as roads and education. 3) promote equality be it political, opportunist or outcome equality.