Goku was not sent to earth to conquer it. He was sent as a baby by his parents to escape the destruction of planet Vegeta. Yes, saiyans we used by the Cold force later on Frieza force to conquer planets, but that was once they were physically mature, not babies. Goku being sent to Earth was never meant for him to conquer it. He was sent there to survive.
Goku was not sent to earth to conquer it. He was sent as a baby by his parents to escape the destruction of planet Vegeta. Yes, saiyans we used by the Cold force later on Frieza force to conquer planets, but that was once they were physically mature, not babies. Goku being sent to Earth was never meant for him to conquer it. He was sent there to survive.
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