Bears with baby elks, cats with their prey, orcas playing catch with baby seals... none of them come close to what humans are capable of when they put their reasoning to work in service of inflicting agony.

Have you ever visited a museum exhibit on torture? The engineering creativity that has gone into exploiting physiology and psychology to cause unendurable, unimaginable pain is astonishing. You'll want to look away. You'll want to forget, to believe once again that cats are worse... but cats are to a first order approximation indifferent to suffering, in contrast to humans hellbent on maximizing it.

JumpCrisscross is taking a techno-optimist's perspective, but while I personally believe that humans should voluntarily seek to serve as "ethical guardians" and to minimize "sentient suffering", I don't trust them to do it. Not as individuals, since empathy is a weak force compared with first-person pain. Not as cogs within societies where inflicting pain is often a means to gaining and maintaining power.