Yes, it probably always comes down to the "trouble-makers." Those who make trouble. They may have good reasons for the trouble they make, or maybe no good reasons at all.
They can stir up trouble just about anywhere, and at any time. They are unpredictable, unless you predict that trouble is right around every corner - and then in that case, you'd be a pretty damn good prognosticator.
Sometimes the trouble is just annoying, and sometimes it blows a hole in the fabric of our reality. It's the same impulse. The idea of stirring things up, upsetting the apple cart, turning the world upside down. Just because.