Emotions (like regret) are not falsifiable, because they are not scientific phenomena. Similarly, you cannot have a scientific study on whether art is good, or if god is real, because they are by definition unscientific phenomena. That is why unscientific studies like this post, should not be allowed in a forum on science.

But perhaps the more important point here, is that conflating unscientific matters with actual science, has been at the heart of the anti-science movement, since science was discovered. It makes it much easier to discredit all of science as a whole, when you start claiming that social studies is science.