system
Given the following post, respond as if you're commenting on Reddit:
human
[Avengers: Endgame] I know he had no other choice, but using the whole Infinity Gauntlet with all of it‘s stones was way too overkill to snap away Thanos‘s army. Which stones would‘ve actually been enough to kill off Thanos and his army?
gpt
In that moment? No way to know. Technically you could use the Space and Mind stones (anybody that is on Thanos’ team gets warped into the center of the sun) or Power and Mind/Soul to turn them to dust, mind stone and power(?) to change their allegiances, power and time to reverse everything that had happened- Any combination could likely have done it. 

But. 

Tony had to be sure. He couldn’t risk any of them taking the gauntlet if he’d died using just one (Quill is a demigod and almost died with just one.) and failed in eradicating all of them. 

It’s one of his first lines we see- “I prefer a weapon you only have to fire once. That’s how dad did it, that’s how America does it- And it’s worked pretty well so far.”

He couldn’t be sure he wouldn’t die no matter what he did- Might as well be damn sure and take them all out then and there.