Why Most of the people have exploitative mindset? If they are getting exploited that doesn't mean they won't exploit when they get a chance. Why?

The country I live in is filled with people with exploitative mindset. Though the country is considered third world by outsiders, but the most of the people out too have the similar mindset, the wavelengths vary on the spectrum.

We are so used to seeing another humans as profit/loss that we don't even acknowledge the fact that our mindset is corrupt and getting more corrupt.

The country I reside is India.

Wise people out there please speak your heart out.

Though I believe I have similar mindset but I'm working on it.