Why are you worried? All they are doing is crashing protons into each other, something that happens all the time in nature. From the article:
'It will be highest energy that man has ever created, but the key word is man, because in nature protons are smashing against each other all the time at much higher energies than those of the LHC,' Fairbairn explained.
Every time mankind does something they say they fully understand, there can be no ramifications beyond what is anticipated.
It reminds me of when I ripped a hole in my wall to do a simple plumbing repair and I found black mold. I certainly did not see THAT coming and boy did THAT have ramifications beyond what I anticipated!
However, in CERN's defense, if it were not for scientists making calculated risks, we would be without many of our technological advancements that we take for granted. So, I guess we should all just cross our fingers this summer and hope the earth does not implode on itself. Maybe, just maybe, we can find out something about the creation of matter (edit-add) and possibly create the next gen of internet access in the process.