translation.en: Now cooperation is, of course, not always nice; all the horrible things humans have been doing throughout history -- and we have been doing some very horrible things -- all those things are also based on large-scale cooperation.
translation.zh: 合作自然不是只有好事。 人类历史上所有恐怖的事件 － 我们的确做过一些非常恐怖的事 － 它们同样也是人类大规模合作达成的。