Imagine betraying your own brother. Your own flesh and blood who reminded you and refreshed your "memory" of who you truly are. Imagine choosing a completely different alien specie over your own flesh/race. Imagine cheaply grabbing your brother's tail then getting him killed. The one who traveled galaxies to come get you and unite you with the rest of the Saiyans so that you are not alone. Now imagine also deflecting 99999999x finger beam blasts from Frieza on Namek away from your son and krillin when they were far away from you, yet letting a finger blast pierce through Vegeta's heart who was ONE inch away from you despite him protecting your son/krillin and keeping them alive. In conclusion, Goku is a traitor, evil, and a disgrace.