Why are children violent?

-Depends on how much the guardian/parent(s) choice of freedom for the child.

-They might think that since they already have a no limits for certain things, then will maybe assume that's the same for other things too.

-The peers around them, they might be influenced to act a certain way.

-The parents/guardians aren't building an emotional connection with them, and they might want to rebel just because to be spiteful.

-And it could be a chemical imbalance in their body that induces them to be increasingly fatigue, lack of vitamins, or could be through genes; for example: depression, bi-polar, etc.