Jung represented the last gasp of Plato's concept of the soul as the source of innate knowledge. Hopefully the last gasp.

Humans have two primary survival instincts: competition and cooperation. Most of what Jung describes can be derived from those. Notice that not only did Jung not consider instincts... but also, you have trouble with the idea. People just usually do. Still, humans have instincts and they are powerful. Any examination of innate knowledge, such as Jung did, is going to be horribly incomplete without consideration of those instincts. ... and that's what I do.