Yep, this is not a good idea.
Personally I think the whole goal of this collider is to find out if there is either new nuclear material or a better way to refine the present nuclear material for the production of more deadly bombs...otherwise I just can not see spending this amount of money, time and construction on a project like this just to see a couple of protons crashing into each other.
Otherwise if this device were able to produce even momentary black holes the results could be catastrophic to say the least...