Much of it has to do with the ignorance of what communism and Marxism actually are among most conservatives, and for others on the right it’s partisan demagoguery.
I'm not ignorant of anything and I think simply lobbing that allegation on CDZ is a violation of the rules. I am also not presenting "partisan demagoguery" and this too, is an insult. You need to refrain from such in this forum or leave. The OP chose to post this here for a reason, so get busy with it.
Communism dates back to Thomas More's, Utopia in 1516 ...or even further if you believe Marx, who claims "primitive communism" dates back to our "hunter-gatherer" roots. So the idea of a society/government being established on the ideas of Communism has been around a while.
It certainly was around in 1776 when our nation was founded, and those smart men who deliberated over what sort of country to establish here, certainly had the opportunity to consider Communism. This idea in opposition to ownership of private property continued to pop up... some Puritans in England known as the "Diggers" confronted Oliver Cromwell over the issue. But this can be traced back to the Spartacus slave revolts... the idea in opposition to private property owners.
It wasn't until late in the 18th century the ideas of Communist Utopia were honed into a proper political movement. From Rousseau in France through a series of philosophers like Hegel and Strauss, culminating in the philosophies of Karl Marx, who laid out the framework for how to bring about Communism through Marxist Socialism.
Of course, things have never quite worked out for these genius philosophers because the one thing they consistently fail to factor in is the human spirit. That's why their brilliant plans only work on paper. When practiced, they result in millions of deaths, tyrant dictators who want to control the world, fanatical religious cults, pestilence and starvation followed by genocide and horrid atrocity on humanity. I mean...THAT IS the history.
SO.... being that is the track record for this genius ideology... the only way to present it with any sort of chance for public acceptance is to disguise it as something that it's not. Let's call it "Democratic Socialism" and that makes it alright. Accuse people of being "ignorant" and not understanding how THIS incarnation is totally different than Marxism. It's what MUST be done in order to carry out the agenda.
And the ultimate agenda, the stated objective itself, is to convert us into a Communist Utopia. You can run from this truth all you like, however, there are people who know much more than you think out here.