In my experience, all of these behaviors are part of the same larger issue. For one reason or another, many children are not learning the problem-solving skills they need in order to avoid getting into a physical fight. As a result, they develop ineffective coping skills.
If your child uses fighting as a coping skill, you may naturally feel frustrated and unsure about how to handle this issue. Often, parents panic when they start to wake up to the fact that things are getting worse with their child’s behavior. They react by using the same tools they used in the past, only they use them harder or louder or more punitively. The problem is that if your child isn’t responding to your parenting methods in the first place, doing it louder or stronger probably isn’t going to change that. In my opinion, it’s not that parents need to use their skills more intensely—it’s that they need to develop more intense skills.