What is good in tornadoes?

I'm not sure if tornadoes can do good at any point. Tornadoes are violent but small storms that start over land. In a tornado, winds begin to move in a circle. They may go as fast as 300 miles an hour. The winds make a tall, dark cloud in the shape of a funnel. The bottom of the funnel may touch the ground. If it does, a great deal of damage can occur. Buildings are destroyed. Cars and other objects can be lifted and thrown many yards away.