I have just seen this and I am in a little bit of a rush so forgive me, but the human psyche is a result of chemical releases, released from glands made of cells, made of proteins, made from DNA.
The levels of the chemicals will dictate your behaviour, we know this even in the most crudest form such as depression and seretonin levels.
Psych is a science with much to learn, it is very much early days. But evolution drove the progression of behaviour, I would need you to be more specific as to what you found objectionable, to be able to explain it.
Xenephobia, which led to racism, makes sense, fear of unknown tribes, different genes, a competitor.
Superstition and religion is pattern recognition gone awry.
Once you know the principles, the motivating force is quite easy to predict and work out.
As for proving it, it may be impossible.
Snare