We are driven by self-interest, it’s necessary to survive. But we need wise self-interest that is generous and co-operative, taking others’ interests into account. Co-operation comes from friendship, friendship comes from trust, and trust comes from kind-heartedness. Once you have a genuine sense of concern for others, there’s no room for cheating, bullying or exploitation.
Yet even the rich have their own kind of suffering, anxiety, doubt, and fear. So in many cases, wealthy people aren't happy! And once those with material wealth encounter small difficulties, their amount of mental suffering is sometimes bigger than it is for those who have faced such difficulties every day.
Misunderstanding may arise by confusing the Buddhist and scientific definitions of death. Within the scientific system you spoke quite validly of the death of the brain and the death of heart. Different parts of the body can die separately. However, in the Buddhist system, the word death is not used in that way. You'd never speak of the death of a particular part of the body, but rather of the death of an entire person. When people say that a certain person died, we don't ask, "Well, which part died?"
Those who suffer from an exaggerated sense of their own ability and accomplishment are continually subject to frustration, disappointment, and rage when reality intrudes and the world doesn't validate their idealized view of themselves.
There is a true feminist movement in Buddhism that relates to the goddess Tārā. Following her cultivation of bodhicitta, the bodhisattva's motivation, she looked upon the situation of those striving towards full awakening and she felt that there were too few people who attained Buddhahood as women. So she vowed, 'I have developed bodhicitta as a woman. For all my lifetimes along the path I vow to be born as a woman, and in my final lifetime when I attain Buddhahood, then, too, I will be a woman.'
Genuine human friendship is on the basis of human affection, irrespective of your position. Therefore, the more you show concern about the welfare and rights of others, the more you are a genuine friend. The more you remain open and sincere, then ultimately more benefits will come to you. If you forget or do not bother about others, then eventually you will lose your own benefit.
You use force, you create fear. Fear destroys trust. Trust is the basis of harmony. The hardliner believes harmony and unity can be brought by force. That's totally unscientific, totally wrong.
When something needs to be done in the world to rectify the wrongs, if one is really concerned with benefiting others, one needs to be engaged, involved. This is action out of compassion.