If adults or even older children behaved this way, it might be appropriate to think in terms of right and wrong, or good and bad. But toddlers fight simply because they have no other way to deal with social problems. For toddlers, conflict is a skill issue, not a moral issue. Toddlers can't solve multiplication problems because they lack the necessary math skills. Similarly, they can't handle problems with other people because they don't yet have the social skills needed to solve them.
Several skills are necessary to get along successfully with other people.
Toddlers, however, have none of these skills. Because of their limited mental abilities, they don't understand that others have a point of view. They certainly don't understand what those feelings or needs might be, and their newly developing language skills don't allow them to communicate well with others. Therefore, they seldom think about how their actions might affect others. Emotions are also overwhelming to young children.