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Why then most of humanity suffer and live in misery? Not much pleasure and good experience for most of us.

Because of greed and lack of love (Which encompass compassion, harmony, consideration, ect) Specifically from leaders. Humanity is imbalanced from consciousness to physically.

That's because humanity's great ability allow us the luxury of worrying about more than immediate survival needs. At least, today. We produce a surplus that sustains us, like squirrels. (Well, they don't produce it...)