This is interesting article; https://www.scientificamerican.com/article/fearful-memories-... and it is a reason I said some evidence.

I am cautions my self not to be romantic about this topic, but at same time neural development is not random structure of cells and arguably brain has predispositions to behaviors. There is possibility that some genetic mutations over single generations are not strictly random, furthermore such genetic mutations specifically evolved over millions of years to introduce changes to environmental pressure. (this is only my speculation of course)