In earlier times, when suffering and early death were common in one's own life, one has fewer compunctions about inflicting them on others. And as technology and economic efficiency make life longer and more pleasant, one puts a higher value on life in general.
早期，当受苦和早逝对于一个人 很平常的时候，人们对造成他人受苦或死亡的内疚感 不会强烈。当科技和经济有效地使 生命延长并且更愉快时，人们对生命的价值总体上有了更高的评价。