Being drunk in your kitchen is not dangerous to others. A fire in your fireplace is not dangerous to others. A gun under your mattress is not dangerous to others. A dog in your living room is not dangerous to others. Once you take these things out into the world, you may not intend for someone to get hurt, but if they do, you're responsible. Given the correct precautions, there is nothing more tame and useful than fire. But, the larger it is and less care taken, the more dangerous it becomes.