It seems like an observation to me. Let’s take the Marxist utopian ideology. It led to 40 - 60 million dead in the Soviet Union (Gulag Archipelago is an eye opening read). And 40 - 80 million dead in Mao Zedong’s China. It’s hard to even wrap my mind around that amount of people dead.

Then a smaller example in Matthia’s cult in the “Kingdom Of Matthias” book. Started around the same time as Mormonism. Which led to a murder. Or the Peoples Temple cult with 909 dead in mass suicide. The communal aspects of these give away their “utopian ideology”

I’d like to hear where you’re coming from. I have a Christian worldview, so when I look at these movements it seems they have an obvious presupposition on human nature (that with the right systems in place people will act perfectly — so it is the systems that are flawed not the people themselves). Utopia is inherently religious, and I’d say it is the human desire to have heaven on earth — but gone about in the wrong ways. Because humans are flawed, no economic system or communal living in itself can bring about the utopian ideal.