Despite the fact that Beerus has a short temper and is a destroyer, he's not actually evil. Though he looks intimidating and can destroy a planet with a single touch, Beerus isn't really a bad guy, it's just his career. "The God of Destruction" is more of a job description than anything, an occupation that Beerus fulfills. Sure, he might be easily angered and he might even attack others, but its never without reason, even if that reason is somewhat petty.

Heck, even this job is not as bad as it seems. "Destruction God" might sound like a demonic position to hold, but what it entails is actually pretty interesting. As the god of destruction, Beerus destroys planets and species that pose a threat to all mortal life, his deeds helping to keep balance in the universe.