Ideology that has done damage to humanity over time

Religion not interpreted in its historical context

-> gave us war and slavery in various forms and let billions of people die

Anything based on a king's or father's authority

-> This is the worst shit and doesn't even serve any purpose except ensuring paternity for inheritance of property. Its original purpose is obsolete since the introduction of paternity testing and egg donation.

The theory of the fully free market. Why did they even test that shit on societies without previously testing it on small groups of volunteers only.

Same thing goes for socialism, Russian version.

Any time people tell stories about family values, the family (male + female + kids) as basis of a given society/state/whatever

-> see Patriarchy

Anyone imposing a quota system in a given institution (yes, that is what I call positive discrimination)