Particle Colliders Are Safe, but What About a Century From Now?

Turning on a particle collider is safe because we can't turn cosmic rays off. But what about some decades or a century from now, when our experiments begin to reach levels that exceed cosmic rays? There will likely be a point where the energies of future colliders rub up against and then eventually exceed the energies of cosmic rays. The very same cosmic rays that we use today is some sort of proof that our colliders are safe. And over time, as physicists develop a greater mastery over the rules of our universe, particle colliders may transition into laboratories that physicists use to bend the laws of physics to their will.