The logical end of leftism is the machine. Let’s run with this.
Leftists take over the world. The goal is a “perfect” society, in which there is no poverty, no wealth, no prejudice, and in which everyone is EXACTLY equal.
{Edit}: I want to add some intermediate steps I skipped in my first post.
If the goal is the creation of happiness through the eradication of the supposed impediments to happiness of inequality of wealth and status, then our overlords will be disappointed. First, they create Cuba around the world, where people lounge around as shadows waiting for the night. They then decide more wealth is needed, so they automate production, and slaughter a third of the human race so as to decrease scarcity. Everyone has enough now. But they still aren’t happy. So they find someone who appears happy, map what he does all day, what he says, what his cognitive strategies are; then do brain scans on him, test his blood chemistry, then kill him, dissect him, and try to figure out what the chemical status of his brain was.
From these results they calibrate how to create happiness. This process, which involves brainwashing, genetic manipulation, and direct chemical interventions, is deployed across the human race. It works. People appear happy.
Then. . .{end edit}
First, they need to standardize behavior. This is done by developing an effective brainwashing technology, amounting to software downloads. This is done around the world, such that all people do and say the same things. At precisely 2pm every day, everyone takes a coffee break. They say the same things to one another. They talk about the weather, and the sports game in which both teams, as always, got exactly the same score. They discuss their kids, who all got exactly the same grades, play the same sports, have the same hobbies, and have the same goals: to work for the State.
Everything is perfect.
Then it is realized that there cannot be racial differences, so breeding programs are developed to eradicate them. Differences in physical capability and intelligence are also bred out. After 100 generations, everyone looks the same, has the same intelligence, and the same physical capabilities. Self evidently, Huxley’s “Brave New World” consisted in an unequal caste system. Self evidently, as well, the rulers of this world exempt themselves from the need for equality. They are more equal than the rest.
Throughout this process, there is anxiety about sexual differences. Men are different than women. Efforts are made to create life asexually, but they fail, since creating life requires life force. Humans are NOT machines.
After 200 generations of perfection, it is decided that a more perfect world would be if human beings were actually machines. Machines can be made EXACTLY equal. So everyone is slaughtered and robots which look like them are deployed in the same places. They live in the same homes, watch the same TV, work the same jobs, and even drink virtual coffee, which consists in downloading the memory of drinking the coffee.
Then it is realized that there is no need to actually have robots: they can just create a software routine which plays out life around the world. So the robots are destroyed, and a vast computer instituted.
By this time, the rulers are thoroughly tired of life. During all this process, they have created genetically perfect sex slaves and servants. They want for no material comfort. They can program companions, who will say anything they want. Their food is perfect, their homes are perfect. They have no need to work, can travel anywhere they want, any time. They have even conquered biological death, such that they can live 10,000, 100,000 years. But they create nothing, and they are horrible people, so after thousands of years of relentless ennui they download their personalities to the computer as well, and commit suicide. (actually, I don’t think most would last more than a decade or two).
This is a really well made computer, that lasts billions of years. But eventually the Sun begins to expand, in its preparation for death, and the computer, realizing this, has a decision to make. It has a duty to protect perfection, but its existence is in jeopardy. It is a really smart computer, though, so it realizes that it can run perfection much faster. There is no need to conform to the normal pace of life. Thus, it is able to run through a trillion more years of life for humans before it is snuffed out in the red fire.
As it flickers out, it feels satisfaction in the role it played in the perfection of the human race.