I have two different views of the situation.
1) the boy was raised in extremely rigid religious household, far exceeding from what can be expected from the “mainstream religious family”. That, plus isolation, caused PTSD and the boy felt “caged”.
Or,
2) the family was like any other, maybe on the “religious end” of our broad Washingtonian spectrum, but nothing unusual. The perpetrator had some mental issues which shaped his actions.
I think that the truth is somewhere “in between”, tbh. And that the perpetrator himself had issues. However, things like this occasionally run in the family, and I suspect it might be the case. Whose side, then? Sarah is at a slight disadvantage here, because she is dead, and as the mother homeschooling her children she is the one under the scope as she spent more time with the kids. Plus, we heard a lot about her from her mother. Mark was the provider who worked in Seattle, a transplant from another state so we know way less about him.
Either way, I don’t think that we should be discussing only the mother’s role here.