I think there are actually very small black holes created, so I guess technically they are right. It's not going to swallow up the universe though.
People freak out at this stuff, we have a heard of 70 bison roaming our campus and when the place first opened up they thought they were like the canaries being flown down into mine shafts. The truth is the founder was a naturalist, and wanted to turn the 6500 acres into a restored prarie.
People freak out about stuff they don't understand.
BTW - here are a couple of photos I took last March when I was visiting CERN. I was able to go on a tour down in the Atlas experiment. I watched as they hoisted a huge piece of machinery 100 meteres up through a tunnel, it was a little unnerving. The pictures just don't do it justice, it totally freaks me out that these things are so big yet are examining things so small. It was really an awe inspiring.
Hoisting the bobcat like machine 100 meters up:
The Atlas detector:
And here is a shot looking down 100 meters. This is where that machine was lifted through.