The psychologist Steven Pinker and others have shown that all around the world people are becoming less and less accepting of suffering in ever-widening circles of others, which has led to declines of all kinds of cruelty and violence, from animal abuse to domestic violence to capital punishment.
Psiholog Steven Parker  je, sa ostalima, dokazao da ljudi diljem svijeta sve  manje i manje prihvaćaju patnju u sve više širećim krugovima drugih, što je dovelo do pada okrutnosti i nasilja, od životinjskog i obiteljskog  zlostavljanja do smrtne kazne.