Avengers: Infinity War

[Cheesegear]

What about planets and places where there are an over abundance of resources?

What about how the Infinity Gauntlet can do anything? Including terraforming.

What about places where there is a small population and culling half the number dooms the populous to extinction?

Something about the gene-pool, something about average IQ in a population.
Something about how certain individuals in any population - especially those at the top of whatever social structure is in place - and how random removal of said certain individuals causes society to collapse.

What's the exact number that's sustainable but not threatening?

Imagine if you had, like, something like a Time Stone, that could allow you to travel back in time to any population limit you decide.
What if you didn't just kill everyone? But enacted future population control?
Why is killing first on the table?

What about places where they are stable, which means that they get back to a high population again. Are you gonna wipe them out again?

Terraforming. Genetic engineering.
Do literally anything.

With unlimited power...Just kill people, I guess.