Holy shit ya read the extrapulation of potential danger?
"The CERN study [Ref. 1] is a remake of a similar study for the earlier Relativistic Heavy Ion Collider at Brookhaven (RHIC) [Ref. 6] adapted to the LHC. 
It is important to notice that: The study for the RHIC had concluded that no black holes will be created. For the LHC the conclusion is very different: "Black holes could be created!" ! 
The main danger could be now just behind our door with the possible death in blood of 6.500.000.000 (US notation 6,500,000,000) people and complete destruction of our beautiful planet. Such a danger shows the need of a far larger study before any experiment ! The CERN study presents risk as a choice between a 100% risk or a 0% risk. This is not a good evaluation of a risk percentage! 
If we add all the risks for the LHC we could estimate an overall risk between 11% and 25%!. 
We are far from the Adrian Kent's admonition that global risks that should not exceed 0.000001% a year to have a chance to be acceptable. [Ref. 3] .Even testing the LHC could be dangerous. Even an increase in the luminosity of the RHIC could be dangerous! It would be wise to consider that the more powerful the accelerator will be, the more unpredicted and dangerous the events that may occur! We cannot build accelerators always more powerful with interactions different from natural interactions, without risk. This is not a scientific problem. This is a wisdom problem! 
Our desire of knowledge is important but our desire of wisdom is more important and must take precedence. The precautionary principle indicates not to experiment. The politicians must understand this evidence and stop these experiments before it is too late!"
http://www.risk-evaluation-forum.org/anon1.htm
THere is alot on that document. In short what these guys are finalising is a death sentence for the planet. 
Estimate anywhere between 7% chance to 25% chance of planetary extinction.