Your choice for the word "blame" is telling? Blame would not be the word I'd use in this case. It's understanding. Understanding that people have traumas. Traumas percolate through the generations.
Without elaborating too much - both in my wife's and my family their traumas are for a large part World War II related. Active fighting, hunger, uncertainty, refugeeship, absence - it's all reflected in our (grand-)parents generation and thus in our genes and upbringing. We have our own traumas that I'm unable to reflect on yet. That's why I feel an extra sadness when watching Ukrainian children. Traumas live on for ages.
Thing that comes to mind: We have local cultures celebrating battles with Spain 400+ years ago. Humans are a hardy bunch. I don't think it's biological after many generations, but culture is an important part of humanity.