system
Given the following post, respond as if you're commenting on Reddit:
human
[Metal Gear Solid 5] how do soldiers that Snake Fultons/Kidnaps get convinced to join mother base?

Like do they get offered a job once extracted and can either accept or refuse or are they basically enslaved?

I was playing before and i just decided to kill everybody in an outpost. When I was done, I noticed a soldier who was only wounded and not dead. I scanned him and saw he didn’t have bad stats so I fultoned him out of there and he survived. Is this guy pissed at me now for killing all his men?
gpt
One of the biggest things the Diamond Dogs (and before them MSF) have going in their favour is Big Boss's dream: a warrior nation of soldiers who can choose what they want to fight for rather than being pawns of the government. This is what would eventually become the idea of Outer Heaven. It's very tempting to any soldier. 

On the other hand there is a degree of psychological manipulation and brainwashing, but also breaking whatever brainwashing they went through before you captured them.