Welcome to Dragon Ball Answers. What would you like to know?

Because Goku was crying when Broly was a baby and that annoyed him so. The crying would drive Broly to insanity, and a hatred towards Goku that he carried all throughout his life, so it would make sense for him to take revenge on Goku, not only stopping the memories of Goku perhaps crying inside of his head, but just to calm himslef and his senses at least temporarily or for a while.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.