What if the fact that we cannot erase bad memories/traumatic experiences is actually a bug in the optimization process of our own neural network, which decided to converge at a local minimum instead of the global minimum?<p>Obviously the prerequisite for this would be that backpropogation of error actually occurs in the brain, but what do you think?
A person barely gets away from a predator or survives a near-drowning. How would erasing that traumatic event have an evolutionary advantage?<p>Your question uses the language of machine learning to speculate about human memory. That seems pretty thin.