Its not necessarily an ideology but all the worst ideologies have at root a lack of empathy and active methods to extinguish any trace of it. So lack of empathy or the violent suppression of it root and stem

Religion

Isaac Asimov famously said, “There is a cult of ignorance in the United States, and there has always been. The strain of anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that ‘my ignorance is just as good as your knowledge.’”.

The idea that any idea is worth listening to because someone believes in it.

Show me the proof.

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