Extinction seems a bit extreme to me, but if we're just considering general behaviors, it's way easier to eat sugar, watch TV, masturbate, be promiscuous, deceiving etc. than it is to do the opposite.
However, there are limits. It is in fact difficult to perform acts of pure evil, probably because we have some innate degree of empathy, sympathy etc.
Empathy, sympathy and so on for their own people? Sure. For others? Not at all. That's from Christianity, actually. You only think it's simple innate human nature and take it for granted because your society has not yet totally lost Christian morality. Before Christianity gave our civilization its moral foundations, even concepts as basic as "human life is inherently valuable" were not much of a thing.
The things that heathen peoples have historically always done to each other, and in fact to this day still do to each other, are horrifying. Most people in the west simply do not know of it, because for 97% of them, if a piece of information is not served to them in a silver platter by a social media algorithm or by the TV, it might as well not exist at all. If they did know about this, maybe we'd see people actually appreciate the moral heritage given to them by Christianity, which they are in the process of losing since they've rejected the root of it, and in many places it has already been totally lost.
Have you heard about what Indians do to people of "lower castes"? All the rape, murder and dehumanization? Did you know that human trafficking is still seen as perfectly normal in much of the middle east, to the point where if you travel to even "westernized" places such as Egypt with your wife or daughter, it's not particularly rare for a complete stranger to casually come up to you and offer you camels or cows or whatever in exchange for them? What do you think happens to western women when they go there alone?
Vikings cared deeply about their own people, but did not see any problem whatsoever with raiding foreign villages or with the acts of pure evil that such raids involved. This is because they were barbarians. People only stop being barbarians when they convert to Christianity. Our nations are not Christian anymore, and I think everyone has noticed at this point that we are seeing an awful lot of barbarism going around in recent times, and it's only going to get worse and worse over time. If God grants you a long life, you may live to witness the reason why your forefathers built things like this:
On some level, I agree that all humans have a God-given inherent moral compass. There's Romans 1:20-21 and whatnot. But if you are born and raised in a deeply demonic society, then this can be taken away to a very large extent. I don't think Islamic and Mongol barbarian hordes found it hard to perform acts of pure evil. People need to be Christian or this is what you get: Might makes right. That's all there will be to life.
