I believe that's what humanity should strive for, but looking at a labourer making $5 a day, it would be easier for him to 'hate the rich' neighbour who makes $10 a day and can afford an Air Conditioner than appreciate the fact that he is well off compared to his grandfather or people in neighbouring villages making $1 a day in terms of health, etc.

Also the experiment of being given the choice of either getting nothing or getting $X and giving their worst enemy 2*$X. Small groups often compete against each other, "keeping up with the Joneses", and while it is a sort of hedonistic treadmill, it's an easy way to gain satiety.