Saiyan Master Vegeta
Terrible scenario. Goku isn't that stupid, nor that impressionable. If Goku knows that Lex is the enemy, he won't give into those tactics.
Yes he is. Check the fight against Raditz. "Oh please spare me brother, i'll go away, pretty please?" he lets go of the tail and gets his a** handed to him. Now we're talkin' about a far more inteligent character than raditz ever was. He could trick Goku into breaking his own spine if necessary. Lex has all the wits necessary to fool that brawns for brains saiyan.