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.

Why? Try these on for size:

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.

How do you perform a lap dance for your boyfriend or husband?

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.”

—John Adams

Where's Marty McFly's guitar? Search is on for 'Back to the Future' prop 4 decades later - NBC News

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.

—Alexis de Tocqueville

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.

Can This Blue Chemical Really Boost Your Brain? Here's What We Know. - ScienceAlert

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.

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

My cantankerous beagle is very badly behaved at the dog park and always starts barking at the other dogs. Would pepper spray be an effective method to correct his inappropriate behavior?

—Thomas Jefferson

—Benjamin Franklin

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

The Action Network: Cracker Barrel 400 predictions, picks, odds for Nashville - NASCAR.com

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.