You have made lots of points which I disagree with. But hey, you are entitled to your opinions.
Personally, I believe that if everyone achieved more of their goals (whatever their goals may be), the world in general becomes a better place.
In general I am also doubtful of zero-sum perspectives (what you described as "simple maths). This is because I see many opportunities for win-win outcomes everywhere I go. Basically, situations where everyone gains something, and everyone walks away feeling more satisfied, more pleased, more fulfilled.