@Victor Eremita,
I don't know if this has been stated or not (I read page 1 but didn't read through every other post), but the particle collider won't cause the end of the world, the universe, create a black hole, or do anything else besides help scientists understand some questions that have been previously elusive.
The collider operates by, in general terms, having particles smash into each other at extremely high speeds.
Now, consider the fact particles constantly collide into each other throughout the universe, throughout our galaxy, our solar system, and even against, for example, the surface of the Moon, at speeds far greater than the collider can possibly achieve.
I hope the logic is understood.