system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Why didn't Thanos just erase all avengers away after he snapped the fingers so there will be no one to come back and try to get them or no need to destroy them?
gpt
Thanos isn't "The Cold and Ultra-Rationalist Titan", he's called the "***Mad*** Titan".

Before the Snap, he believed as long as he'd achieved what he set out to do, the universe would be grateful once they start to flourish & enact population control to maintain their prosperity. The Avengers then in his eyes are not his enemies, merely misguided fools that would soon see the right path.

But when 2014 Thanos saw future Nebula time-travelling with the Avengers just to undo his life's greatest work, he realized that the Universe will never ever be grateful for what he will and have had done. Never mind the key facts that civilization was crumbling away as entire populations are suffering from mass PTSD & depression from watching their loved ones turned to dust without cause. Never mind that there are more Chaos around the universe as formerly secured civilizations are pillaged by raiders because the random Snap took away their military or anyone that could have helped defend.

So, he time-traveled to the future with his army. This time ready to remake the universe in his image so that ***no one*** would ever questions the bones that make up its foundations.