After America won the Cold War, some believed we had come to the 'end of history,' and budget-cutters celebrated the so-called 'peace dividend.' As a result, we ignored the toxic mixture of militant Islam and terror that ultimately led to 9/11.
If humanity was still in the feral state, we wouldn't have any need for these huge conurbations that we have now, that have turned us into a different bunch all together. In the feral state we would be much more secure, much more familiar with each other, much more mentally well-balanced.