If humans weren't greedy dicks then capitalism or any other form of government would work perfectly. You can't force humans to not be greedy dicks. No matter what system is being instituted it is susceptible to greedy dicks.
The majority of humanity are not greedy or obsessed with profit
The problem is that the few ridiculously greedy sociopaths that do arise per-capita are just so FUCKDAMN good at amassing power and wealth that we assume it's the natural lot of all people
So we just test and dispose of sociopaths at birth, problem solved. We already have the tests for it.
Yep, which is why we need to use nontraditional power tactics like leveraging drones and cyber attacks as well as flashmob tactics and social media control
Money buys you a private army but not loyalty, we need to start early and get idealists positioned in those private armies
Make inroads with the children of billionaires tired of their parents' excesses, this was a valuable vector during the French Revolution that almost no one talks about
More than anything we need to accept the fact that no amount of signs or shouts are going to stop the ultra wealthy from destroying everything for more imaginary numbers in an already unspendable bank account
Which ones? Which ones don't damage their land or steal children from enemies or rape or steal? Please don't try to say any indigenous tribes because they are all guilty of one or more these.
Survivorship bias is so important to remember when talking about human societies. Even our perceptions and knowledge of indigenous tribes is limited by survivorship bias. Consider that there may have been many more "peaceful" or "non-greedy" tribes, but they were conquered by groups of people that were more violent and selfish. There must be so many tribes that have been wiped away without a trace, tribes we know nothing about.
But the real barrier to this hypothetical "non-greedy population" idea is the matter of scale. A peaceful village of 100 people is easier to create and maintain than a peaceful global population of 8+ billion. Even if indigenous villages managed to build such utopias where greed doesn't exist, their models wouldn't easily scale to the world we live in now.