The first are obvious, the ones that start trouble because they delight in it. They are also known as criminals, terrorists or nitwits.
The second are the ones that invent imaginary problems and then go make trouble to try to solve the imaginary problems. These folks don't like trouble and are trying to prevent trouble, and in so doing are targeting what they think is a source of trouble. The trouble with that is, it is just imaginary trouble.
Many problems are imaginary, rather than real. If a problem has not been analyzed exhaustively from every angle, in cold blood, without passion, then it may not be a problem at all, but just a symptom of one of H. Sapien's finer attributes, creativity. We love to create things, and one of the things we create is imaginary problems. Much of what is perceived as reality is in fact imagined, distorted, or misinterpreted. For the same reason, humans have difficulty beating computers at chess. Computers analyze exhaustively, from every angle, in cold blood, without passion. Should we wish to improve ourselves, we should emulate our wondrous machines, without abandoning our good quality of love.