Question

Distrust of a single leader with absolute power, a feeling based on bad experiences under the constraints of the British monarchy, emerged as an important theme for the Framers of the US Constitution. Yet the framers developed a form of government that includes a central leader, the president, as the head of the executive branch. This leader is responsible for carrying out the actions of government necessary to enact the laws passed by Congress.

Answer 1

If your asking the reason why they did this is if you look at the process at which they did it. The articles of confederation failed as they gave government few powers. So in a basic social contract theory, they gave away a few rights and or freedoms for a mutual benefit. Also written in the constitution there is checks and balances, which was brought up in the federalist papers. This gained support for a new and updated government.