Evolution only responds to the current situation, it has no foresight. Therefore if the environment in which an organism lives changes, especially suddenly, it is bound to be badly adapted to the new environment. And it may take millions of year of struggling before it becomes efficient and well adapted to its new circumstances.

Humans probably began to talk and develop language and culture, only in the last million years or two, in a major way, only in the last few thousand. And language, the culture it creates and technology, have caused perhaps the biggest and most rapid change to any animals environment that, probably, any animal ever survived. We are therefore most likely completely ill adapted to the new world in which we now live. Like pandas, which were meat eating bears, who took to eating bamboo quite recently, and now struggle to survive on a diet their gut is ill adapted to digest.

So we have a desire for high value food which was rare on the plains of Africa. But now that same desire when sugar and meat are easy to get, probably kills millions every year.

But the biggest change which took place when we began using language, was that we gained a vastly greater power to, create and spread, lies and fantasies. Our new environment is now awash with vast amounts of fiction and untruth, which we create at little cost. And of course because it all happened in a twinkling of an eye, as a side effect of an adaption, which was designed originally, for practical things, like helping us make better hunting plans. We have no instinctive safeguards against it, no sceptical instincts built in, we have no defenses against fiction, we are made to be deceived used and manipulated, by anyone with a voice.