These things are only about 4 GeV (4 times heavier than a proton, much lighter than the Higgs boson, much smaller than the energies in the LHC, an extremely easy energy for cosmic rays to reach). Neither energy nor density are keeping us safe if these things are dangerous—the LHC just detected them by making lots of them and having really good sensitivity.
Nothing terrible was going to happen. As has been pointed out, collisions that energetic or more happen all the time in the upper atmosphere.
Energetic perhaps. But as dense also?
These things are only about 4 GeV (4 times heavier than a proton, much lighter than the Higgs boson, much smaller than the energies in the LHC, an extremely easy energy for cosmic rays to reach). Neither energy nor density are keeping us safe if these things are dangerous—the LHC just detected them by making lots of them and having really good sensitivity.