If something causes a lot of damage, you can talk about its destructive force or power. Something is destructive when it really messes things up.
The word destructive comes from the Latin destruere which means literally to unbuild. In addition to describing a storm or battle, the word can be used for the things people say as well as do. If your mother's comments about your weight cause you to eat more bon bons, you could say that her remarks were destructive to your diet.