not the opposite of an atomic bomb: they’re doing the opposite of fission (splitting a particle into pieces), which is fusion (throwing particles against each other until they split and their pieces recombine to form different kinds of particles). both reactions can be used in the craft of bombs, the generation of energy, and scientific experimentation.
as i said before, the fact that the tiny black holes disappeared is still disputed. they will naturally decay if the singularity at their core isn’t stable, but we don’t know for sure about a certain “Hawking radiation” which is theoretically behind the anihilation of the ones that are stable — in fact, if we did get swallowed by a black hole, it would be a somewhat funny step forward to science: it would prove that the theory of Hawking radiation (which hasn’t just yet been confirmed or refuted) is, well, wrong.
something is bound to happen, we just don’t know what. we have a few clues as to what we should be looking for — Higgs bosons, supersymmetry, strange matter — and perhaps what we’re looking for is actually none of these: but it still must be somewhere right under our noses. something causes particles to have mass, and that something must show up at some point or another, in some form.