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High energy cosmic rays impact every square centimeter of the earth tens of millions of times per second. The LHC will not produce as much energy as those cosmic rays. Those cosmic rays have not produced a sustainable black hole on earth in billions of years.
Additionally, as explained to me by someone who is part of the CERN project, if theories predicting that a black hole of that size would evaporate within a few femtoseconds are wrong, then the theories predicting that they could be formed are also wrong. Either a black hole could form (and even then only because scientific minds don't like to use the term "impossible " for anything, however ridiculous it is,) and the only trace of it would be its evaporation, or the energy levels required are so high that the LCH can't produce one.
The dangerous things that can happen are
1: Someone climbs a fence, unlocks a door with flashing warning lights on it, and walks into a "hot" area too soon after a test and is irradiated.
2: One of the superconducting electromagnets quenches, the beam is released and blows a big hole in a wall, and a massive release of liquid helium forces everyone to hit the floor so they can breathe. A whole lot of money is wasted and the project is set back two to three years and a few people could be killed if they're in the wrong place when it happens.
3: Remember the religious nut who blew up the machine in the movie Contact? There are real people like that. They can cause a lot of disruption.
4: An alien ship flies by earth, is disgusted that our pathetic species hasn't even discovered the Higgs boson yet, and annihilates us out of spite. This is more likely than a catastrophic black hole being formed.
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