Not “people getting killed”, this is “all humans”. The only other ELE for humans that could possibly be caused by other humans that has been feasible is nuclear war. And lots of blood has been shed to prevent new players from getting bombs.

Personally I'd wager humanity has a greater chance than 10% of us all dying in a huge nuclear war sometime in the future. Is the claim really that this belief cannot be taken seriously unless I somehow violently attack nuclear silos, centrifuges and similar?