Big Bang

I know the Big Bang experiment got restarted but why was it stopped in the first place? From BS,

The LHC will certainly make a large contribution to the sum of knowledge about
known unknowns. But everyone of the 10,000-odd scientists collaborating in the
experiment must be hoping fervently for a breakthrough into the realm of unknown
unknowns. Some completely new unanticipated results could arise from the
collisions and those could change current cosmology

The first time I came to know about this experiment is when I was reading something on 2012. So, can things go uncontrolled or unseen in such 'recreating history of nature' which can create history of disaster? At the other end, what kind of break through are we looking into?