Pops seems to imply that by asking for permission, Maverick is showing that he doesn’t truly want to kill Red. For Maverick, killing Red is part of the rules on the street—but it’s unclear, to Pops at least, if Maverick actually wants to follow through. Asking Pops for permission, though, also reinforces that Maverick is still a kid. He still wants his father’s approval and perhaps he even feels like a young, scared child as he faces such a huge decision.