Why did the Framers of the Constitution establish representative rather than pure democracy?

Answer 1

James Madison, in Federalist No. 10, advocates a constitutional republic over direct democracy precisely to protect the individual from the will of the majority. He says:

Those who hold and those who are without property have ever formed distinct interests in society. Those who are creditors, and those who are debtors, fall under a like discrimination. A landed interest, a manufacturing interest, a mercantile interest, a moneyed interest, with many lesser interests, grow up of necessity in civilized nations, and divide them into different classes, actuated by different sentiments and views. The regulation of these various and interfering interests forms the principal task of modern legislation and involves the spirit of party and faction in the necessary and ordinary operations of the government.

[A] pure democracy, by which I mean a society consisting of a small number of citizens, who assemble and administer the government in person, can admit no cure for the mischiefs of faction. A common passion or interest will be felt by a majority, and there is nothing to check the inducements to sacrifice the weaker party. Hence it is, that democracies have ever been found incompatible with personal security or the rights of property; and have, in general, been as short in their lives as they have been violent in their deaths

John Witherspoon one of the signers of the Declaration of Independence said:

Pure democracy cannot subsist long nor be carried far into the departments of state – it is very subject to caprice and the madness of popular rage.

Alexander Hamilton said:

That a pure democracy, if it were practicable, would be the most perfect government. Experience has proved that no position is more false than this. The ancient democracies in which the people themselves deliberated never possessed one good feature of government. Their very character was tyranny; their figure, deformity.