system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Why would Thanos give Loki 1 Infinity stone to secure another?

**AoU spoliers**, so we know that Loki's staff contained the mind stone, we know from the Avengers that essentially the staff and mind stone were given to Loki by Thanos. Why would Thanos give Loki the mind stone? Does Thanos not need all of them so he can do whatever it is he needs to do? What if Loki did not want to give it nor the Tesseract to Thanos after her retrieved it?
gpt
Thanos knew that Loki was a little shit. He knew that the Tesseract was on Earth. He knew Loki wanted to make a statement by conquering Earth. 

He still needed to collect the other gems anyway, so rather than show his hand (remember, some people out there are keeping an eye on these things) he sent Loki to snatch the stone for him. Worst case, two of them are on Earth, and he just has to make a stop at wherever Earthlings keep things like that.

Also, Thanos is apparently slightly incompetent.