According to the Marvel Wiki about the Infinity Gauntlet, it controls reality itself and can create laws of its own. Under that, it would be possible to remove the very concept of greed. Not only that, but the strawman above is a valid point as infinity is infinity, meaning there is no limit no matter how much one tries to be greedy or needy. Even if the greed grows, there is no end of the supply for the demand.

Killing half of everyone in the universe is just as costly as creating an infinite amount of resources, as that means taking the entire existence of the infinite universe you exist in, and killing an infinite amount of people (Although half of the entire population, a half of infinite is still infinite). Not only does it not shrink the total greed in the universe, but now an infinite amount of people, some of whom may have never been greedy (Due to infinite, it is a 100% chance that there exists people that are not greedy) are killed by the sins of other people.

"life could survive almost endlessly on a finite resource budget if it stops expanding"
what kind of idiot logic is that? non-renewable resources are still none renewable. if the population of earth stopped growing completely, we'd still be using up resources and we'd still run out