I'm going to go for craving and ignorance but I am a Buddhist

Good question. I believe narrow minded self importance and greed, on the part of the few rich people who run things. I believe if there was truly equal rights and real justice, we would be alot better off here on earth.

Humanity?

The Rooth is humans starting cultivaring land instead of roaming Free. Read Yuval Hararis ”Sapiens”. Christian

Humans

The root is human nature. Beyond that are things like greed, need for safety and simplicity. In addition, psychopaths contribute. Wikipedia says, "Psychopathy has a much higher prevalence in the convicted and incarcerated population, where it is thought that an estimated 15–25% of prisoners qualify for the diagnosis. A study on a sample of inmates in the UK found that 7.7% of the inmates interviewed met the PCL-R cut-off of 30 for a diagnosis of psychopathy. A study on a sample of inmates in Iran using the PCLV found a prevalence of 23% scoring 18 or more. A study by Nathan Brooks from Bond University found that around one in five corporate bosses display clinically significant psychopathic traits - a proportion similar to that among prisoners." .....Etc.

I should add that religion plays on the greed by saying god has entitled us to this land or oil reserve.

Seeing a starving child as a problem someone else will take care of.

Religion, power, greed, and the compulsion to control others.

God

Greed and the corruption that comes with it and religion.

Human desires. Without this there would be no problems only facts.

Corruption and greed.