Often this approach can be comforting to a child. Children don't like to be out of control. It scares them. An adult who is able to take charge of the situation and remain calm and in control can be very reassuring. It's difficult to reason with a screaming child.
Tantrums really scare most kids.
Often, they are not sure why they feel so angry and feel rather shaken when it is all over. They need to know that you disapprove of their behavior, but that you still love them. All children will have them sometime or another. Look for patterns in behavior that can give you clues about how to avoid conditions or situations that seem to encourage tantrums. Set realistic limits, and help children stick to a regular routine.