Screaming Meat
Unconfirmed Member
Is there a story explanation for how enemies are so amenable to join Snake's team after a fulton to Mother Base?
Not so much story-wise as mechanically.
In PW, when your Heroism is low, kidnapped soldiers spend time in MB's brig until they are "convinced" to join and become less hostile (we're never told what that involves exactly but I doubt it's Big Boss saying "CAM AAAAAAAN, GUY! CAM AAAAAAN!").
As your Heroism level increases (feats like headshots, no-alarms, no-kills etc. all increase it) and people hear about your adventures, freshly captured troops tend to "turn" quicker. At a very high-level, they require no convincing at all. Hell, people come to MB specifically to join up (volunteers).