Really, is the (extremely distant, near im)possibility of catastrophe the foremost thing in people's minds when it comes to the LHC?
I, personally, am excited, and would rather not have a fringe idea come to dominate a discussion where so many interesting and more plausible things could occur.
I don't pay credence to this. If you know of any scientific reasons to believe that sizable black-holes could be created that would be a different issue.
We're exploring new territory, of course we are not going to know what will happen. That's kind-of the point. Generally (like in all science and engineering projects), they will do things in stages, adding one variable in at a time.
A lot of the early experiments will be making sure they can reproduce what was done in earlier super-colliders without having anything fail. There will be set-backs and things that need to be fixed. That is the way all such projects go.