Weeeeellllll... I wouldn't call it Primal Human Nature.
We honestly have no idea what real human nature looks like. We have ideas, and we talk about it like it's a thing.
But to have human nature clean of societal impact we'd need to give birth to a group of children and never allow them human interaction beyond each other in a completely sterile testing environment to monitor their behaviors as they grow and interact.
No language. No people beyond themselves. No cultural expectations. Just living all by themselves.
And, of course, we can't do that to people. It's truly monstrous and unthinkable. What we think about as "Human Nature" is actually thousands of years of capitalist society being applied to cultural norms. Greed is a trait of "Primal Human Nature" because we're trained from birth to perceive objects as owned and that objects can be traded for other objects. So of course it's best to get as many objects as possible so you can have enough for ... whatever.
It's a really tricky thing that we've constructed for ourselves.
Though yeah: Being Nice doesn't fix systemic oppression.
When the Suffragettes stood in front of 1600 Pennsylvania Avenue with white placards with black writing on them, absolutely silent, it was unthinkable and rude beyond all measure and they were thrown into paddy wagons for doing something so vile. In the 1960s African Americans had to march in the streets for their rights and were met with firehoses, lynchings, and riots. All the while they were told to go home and be quiet. Be nice. Stop being so rude.
Would women have gotten suffrage if they didn't say anything? Would blacks have had their rights to work, school, and equal treatment respected if they'd just stayed quiet and were nice about it? It's how they'd been trying to get things done for a long time.
“We must always take sides. Neutrality helps the oppressor, never the victim. Silence encourages the tormentor, never the tormented.”
― Elie Wiesel
“If you are neutral in situations of injustice, you have chosen the side of the oppressor. If an elephant has its foot on the tail of a mouse, and you say that you are neutral, the mouse will not appreciate your neutrality.”
― Desmond Tutu