I've always thought, easily, we humans were our own worst enemy. But that's nothing new, it's been known for many different eras. What gets me is we don't seem to care. Obviously many do, but why not enough?

Egomaniacs seem to always be the problem, but when one pops up in a country, the people, whether they have a choice or not, protect/ignore them. Your disposable remark, to me, is the key. Most need to wake to this fact and at least talk about it. (As for Hal Lindsay, he's just like any other nutjob author who uses grains of some truth to create fear and anxiety to promote his narrative.)