Have you ever had to much stuff lying around and you thought to yourself “I should really buy some shelves to stow everything away”? Then you get more shelves and after everything is in its place you’re left with some extra empty shelves. Now will those remain empty? No, they will be an invitation to get more stuff and fill that space up.

Same thing goes for rescources. Doubling the rescources doesn’t mean that life will suddenly thrive and everybody will live happily ever after. In a very short time life would also double and you’ll end up with the same problem but way more crowded.

And how does “doubling the rescources” even work? Snapping half the life away is easy, just turn them into dust. But does doubling the water mean rivers overflow, oceans rise? Hydrogen is a rescource, does every star goes supernova because it suddenly has twice the amout of mass?

Doubling the rescources doesn’t make any sense. In the Marvel universe there is probably at least one species that sees at least one element of the periodic table as a “rescource”. You’d essentially have to double the mass of the entire universe which most likely would result in a universal gravitational collapse.

Also what would the lesson be that life takes away from this? That each time life expands beyond its means somebody will come along and give you more rescources? Thanos wanted to teach life the opposite lesson. That living beyond your means will result in a culling instead of a reward. It was his way of solving greed, even if he could’ve used the stones to eradicate greed directly, he is called the “Mad Titan” for a reason.

Thanos is probably purple be because his armor is golden/yellow and purple/yellow are complimentary colors that look good together. Its probably a design choice to make his character more recognizable.