Guys, stop worrying about these experiments causing a black hole or a Big Bang. Sure, the energy produced is extremely high, but since the masses of the objects in collision are very small, much more energy would be required for the explosion to decay into a black hole. And even if it were to do so, the black hole would be too small and with low gravity so it wouldn't attract that much matter at the beginning, which would result in it decaying anyway since it wouldn't be able to support itself.
As for Big Bang worries, again, the energy needed to be output is too large for the collider. Even though the collisions allow for the replication of the Big Bang a few moments after the explosion, you can think of the Big Bang as rapidly cooling. Most of the energy is released at the very beginning, so even the great outputs of energy of the LHC will only be a fraction of the energy that was output at the Big Bang.
