"But what if it's the only way to break you out of enemy mind control? I know that if it were me I...well, actually, I'm way too amazing at heroism to get mind controlled - but anyway, if it were me I'd want you to slap me out of it! And, y'know, if you ever get mind controlled when we're on a mission and the only way to break you out of it is for me to slap you, what would you prefer? Getting slapped with my bare hand, or being in eternal mental slavery to a heinous badguy?"