Religion

Any religion. It makes people think of themselves as superior to other groups. It doesn't even matter which religion. They're all bad.

Fascism. It makes people loose their humanity. Fascists endure anything as long as people outside their group are suffering.

American Exceptionalism.

gestures broadly

Nazism seem to be the worst since it's an awful mix of nationalism, imperialism, totalitarianism, state racism, eugenics.

A nazi state basically invades its neighbors and genocide their inhabitants based on race, community or health condition.

So far, only the Third Reich applied it, leading to World War II and the Holocaust, but Japan applied some similar behavior in Asia during WWII.

Bonus point: it doesn't even oppose capitalism, so rich people can still greed.

"Us vs them" mentality.

Religion, because they all believe that they are the only ones who are right, and everyone else needs to believe what they believe, or else something bad will come of it.

misogyny. I'm not saying it causes the most death and harm (though it may), just that I've never met or heard of any dangerous ideology where misogyny wasn't a core element.

Feminism inoculates against fascism.

TESCREAL

It ends in either replacing humans with AGI or massive atrocities in an attempt to achieve it.

And there are people in positions of real power who believe in this stuff and act on it.

Andreessen posted a manifesto where he said that deliberately delaying AGI is basically mass murder and should be treated as such.

The certainty of being right.

Why? Because when (any)one is sure to be right it means the other must be wrong and since they're wrong they probably should not even be allowed to say what they have to say.

Look out for number one. Selfishness is at the root of most dangers to humanity.

Good old fashioned tribalism.

Ignorance.

It's practiced by many, in alignment with arrogance. Many different flags, cloths, creeds and livelihoods depend on it.

Any and every form of dehumanization.

Any and every form of bigotry.

Any and every form of supremacy.

Any and every form of authoritarianism.

Every single person from the homeless guy at the on-ramp to TACO himself is an ordinary human. Some humans are born into extraordinary circumstances, some humans accomplish extraordinary feats, but we are all human. Humans are not born hating other humans. Hate is taught and encouraged and ingrained so that it may be passed on.

Universal Basic Income is a bandaid on a system couched in one of the ugliest human motivations; greed. I chose my name for that reason; Universal Basic Justice. Justice must be the base motivation; not 'eye for an eye' or 'frontier justice,' but the belief in treating others as you want to be treated; the belief in the powers of forgiveness, responsibility and growth; and the power of compassionate care dedicated to help those that are willing to learn and grow.

If and only if all those fail should a human be separated from society in a humane way that prevents their flaws from harming others.

Death Row is not justice. Guillotines are not justice. Systemic violence is not justice. No government nor individual should be empowered to decide who is worthy of justice, of forgiveness, of growth. Of life.

Every human is fallible. Every human deserves the opportunity to recognize their mistakes as well as the opportunity to learn, grow, and make reparations for those mistakes.

I don't see these changes happening in my lifetime. At this point, I'm not sure we humans have enough lifetimes left to achieve these goals.

What I am sure of is the danger and violence incumbent within any ideology willing to look down at another human being.

Individualism.

It has led to a massive amount of duplication of human effort. We could all live massively improved lives if we acted as a community organization instead of a bunch of individual little fuckers whose opinions matter.

Neither is this about an ideology per se nor is this quote my own - but I've read this somewhere -

"The greatest threat to our planet is the belief that someone else will save it."

• Robert Swan (British explorer and environmental activist)

Ableism. As disability advocate Imani Barbarin says, if bigotry is the goal, ableism and eugenics are the toolkit. If you look at the history of any form of systemic bigotry, the justification for human atrocities almost always boils down to “well these people can’t contribute to society, so they don’t deserve to be a part of it.”

TESCREAL Because it serves as an excuse for the oligarchs to do whatever they want regardless of the current impact of their actions with the promise of future benefits

Not an ideology but I say extremisms, of all kind. Not only religious and political, those are obvious, but also day to day habits.

Any ideology may be dangerous. People who are convinced they're tuned into a privileged view on reality may be willing to kill others to protect it. Human history is full of proofs of that.

"On the whole I think that knowledge is preferable to ignorance, and I am sure that human sympathy is more valuable than ideology." — Kenneth Clark

Any, all and each one of them. The moment you stop looking at how things are, you are finished and set right on the course of bringing unjustified pain and suffering

Beauty. It gives everybody the illusion that they can decide or at least criticize everything. We will end with an unstable system where control becomes impossible and things collapse.