Strange color-combination appears everywhere

This question is not blender specific, but it has to do with color choices for lightning. Recently I noticed a strange color-combination for lightning in films and when presenting sculpts. It is the combination of a purple and a green-/yellowish color from to opposite directions.
In this video it is used very often to present the sculpts. I think it is most noticeable with the tree creature at 4:02. I’ve also seen this color combination in some films used as an background, night, dark street lightning.
I personally think these colors look awful.

So my question is: Why are these colors used so often? Do they highlight specific details? Should they be more appealing to the viewer?