They said the same kinds of things about the atom bomb.

I'll comment more when my battery isn't about to die on me.

I'll echo Anthony on this one. Bunches of ignorant people are freaking out about the new particle accelerator-collider, but it's merely out of ignorance.

I did not watch the linked video (didn't work for me), so I won't respond to that specifically.

Most people seem to be freaking out about the possibility of tiny black holes being created in the collider. If they were to be created, their lifespan, before "evaporating" would be about "a billionth of a trillionth of a trillionth of a second". Second, they may not be created at all. The only way they'd be created would be if theories about extra spatial dimensions (beyond the normal 3) were true. I rather doubt these theories, but I'm interested to learn the results of the collider experiments nevertheless. (I doubt these theories because I find them to violate Occam's Razor--not that this is a law, but modern "scientists" [if I'm kind enough to grant them this moniker] have a tendency to reach for bizarre explanations simply because their worldviews don't support simpler ones.)

The most interesting purpose to this largest of accelerators is to try to discover the Higgs boson. Higgs is predicted by the Standard Model but has yet to have been observed. Theoretically, it may explain the concept of mass. It's also needed to "balance" out the Standard Model. (This makes sense if you have any familiarity with the Standard Model.) The Higgs boson is not the only possible particle, though, as there are other theories, but they tend to be more elaborate or complex. (This may be one of few, modern models in physics today that abides by Occam's Razor, to scientists' rare credit.) They may discover something other than the Higgs, several particles, or none at all. There are already theories for each of these alternate contingencies.

I won't comment on the utilitarian aspect of the Large Hadron Collider or the Higgs boson.

You can check to see if the LHC has destroyed the planet here.

http://www.hasthelhcdestroyedtheearth.com/