You mentioned black holes in the title and post and I just wanted to swoop in and address that.
The black hole fear with the LHC was that some of the high-energy collisions *could* throw off black holes from those interactions. But the thing is that these black holes would be commensurate in mass with the energies of those collisions, by which I mean that these black holes would be very, *very* tiny. Even if we made them in the LHC (and it’s not at all clear that that happens), they evaporate almost instantly, and they are practically too tiny to interact with anything. The amount of time that such black holes would exist is generally not long enough for something to fall in, so it’s just never going to grow.
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