It's a matter of proportion. If someone wants to be a firefighter they are also that much more likely to want to be an arsonist. Also, arson convictions are ex

It's a matter of proportion. If someone wants to be a firefighter they are also that much more likely to want to be an arsonist. Also, arson convictions are extremely rare. Most arsons are unsolved. You can imagine how much more likely it is to be unsolved if the person investigating is also setting the fires