It's reasonable to desire that resources extracted from a country or region should benefit the people of that country or region more than the companies extracting those resources. The problem is that that is a classic tragedy of the commons, making it unreasonable to expect or hope that that sort of problem gets solved on an individual basis. Yes, let's hold mining companies to task for not further helping impoverished communities near mines, but let's not mistake that it is the government of Argentina that allowed this to occur to begin with.
Nobody is suggesting the mining company is the "bad guys" for having an interest in making a profit. They are suggesting they might be the "bad guys" for allegedly exploiting the naivete of local residence to pay a pittance to wreck their environment.
That's a clear false dichotomy: either people have no self-interest, or else they must be the bad guys. But almost everyone in any market operates primarily from self-interest. If a company that was losing money offered you your current job at twice the salary, would you say no, because you placed their interests above your own? Of course not. If you didn't take it, it would most likely be because you worried the company would go broke and lay you off, a clearly self-interested motivation. And the communities here - if someone offered them far more than the lithium was worth, would they turn that down? I really don't think they would. So either being mainly motivated by self-interest doesn't make someone bad, or else almost anyone who buys or sells anything is bad.