There's little reason to believe so. Minds shaped by reinforcement learning will usually fall back on established behaviours, even in novel and unexpected situations. In stable societies, these behaviours include baseline trust, respect for property, non-violence, reciprocal altruism etc. Only if exposed to different and more hostile circumstances for a longer period should we expect different behaviors to develop.

9/11 in NY being a classic example of how that isn't what people tend to do.

A wild disaster - terrorist attack - the likes of which none of those people would have ever witnessed before. A couple of the world's tallest buildings collapse. Thousands dead. The exact details of the circumstances mostly unknown, along with the continued risk.

The New Yorkers that had to evacuate the greater area, post attack and collapse, proceeded to overwhelmingly behave with great calm. They didn't trample each other to death. They didn't behave crazily. They walked out of there, peacefully, covered in collapsed building dust.

One of the many iconic photos of that relative calm behavior:

https://i.imgur.com/EBCJm72.jpg

It's true people do extreme things in extreme circumstances. It is also true in general that we are born because we are born survivors.

While it might seem probable that people would seize the opportunity when you are not in a survival situation, once your brain kicks into survival mode almost nobody will think of that opportunity, not even most of those who previously ideated themselves doing the looting.

There is no reason to think looting for riches during disasters is a valuable survival strategy in general, and somehow we know this without being aware of it, as is the case with a fair bit of the machinery of our mind and body that tries to keep us alive.

The point of the article is that your assumption, the assumption that people often make, has been measurably shown to be incorrect.