Why is the word "democracy" not in the preamble of the US Constitution?

Another tendency, which is extremely natural to democratic nations and extremely dangerous, is that which leads them to despise and undervalue the rights of private persons.

In other words, our Founding Fathers and other Whig intellects of that time well understood that democratic methods are the surefire means to do serious damage to the rights guaranteed under republican self-government.

—Thomas Jefferson

Republican Trump is a billionaire, president, won't be held accountable for multiple felonies, and pretty much has whatever he wants. So why is he always whining and crying about stupid, pointless stuff? Is he incapable of happiness?

Why? Try these on for size:

Meanwhile, when the Democratic Party formed in 1828, it was with a Tory outlook keen on robbing others of their rights:

To Indians: “Pack up what belongings you can carry and start walking to Oklahoma. Your fertile lands are ours now. We voted fair and square and your side lost.”

Are today’s baseball pitchers faster than a few years ago, or is it that radar guns have improved and get the pitch speed as it is released rather than as it reaches the plate?

—Benjamin Franklin

[with republicanism being the rights-protecting form of governance afforded us by our Constitution]

Majority-rules democracy is the way that majorities run roughshod over minorities, destroying rights and all ideas of equality under the law. No fair-minded person wants anything to do with democracy.

Is crossdressing being a transvestite?

To slaves: “You can forget your notions of freedom. We voted fair and square and your side lost.”

—Alexis de Tocqueville

To blacks: “You can’t drink from that water fountain… eat in this cafeteria… ride this bus… go to this school. We voted fair and square and your side lost.

Why do Democrats call any Republican "Magats", like they are subhuman?

The republican is the only form of government which is not eternally at open or secret war with the rights of mankind.

When the people find they can vote themselves money, that will herald the end of the republic.

—John Adams

Why do I feel worthless most of the time?

I do not say that democracy has been more pernicious on the whole, and in the long run, than monarchy or aristocracy. Democracy has never been and never can be so durable as aristocracy or monarchy; but while it lasts, it is more bloody than either.