The story of Snow White does not explicitly address the question of why people do bad things. However, in many fairy tales, including Snow White, the villains are often portrayed as being motivated by jealousy, greed, or a desire for power.
In the case of Snow White, the Evil Queen is motivated by jealousy. She is jealous of Snow White's beauty and becomes obsessed with killing her so that she can remain the fairest in the land. The Huntsman, who is sent to kill Snow White, is also motivated by fear of the Evil Queen's wrath.
These motivations are typical of fairy tales, which often use simple, archetypical characters to illustrate moral lessons and reinforce cultural values. In this way, Snow White can be seen as a cautionary tale about the dangers of jealousy and the importance of inner beauty over physical appearance.