No the "they have been wrong before" argument just dosn't stand up. The people who have been wrong before is the idiots who make predictions without understanding the science. Like the people afrade of lack holes. Have you any idea what would happen if we created a large black hole, and by that I mean one the size of a grain of sand? Absolutely nothing, it's velocity would take it outside the Earths orbit in seconds, ther will be nothing to stop it and it would be gone. With the LHC we are talking about very small ones indeed.