[watwut]

On top of head, I know about three shooters who lived with biological father and multiple who were adopted (e.g. no biological parent).

I also noted that you do not mention divorce rates and how many children without problems are fatherless.

Finally, yes, in unstable or violent or otherwise troubled families it is usually mother that stays with kid and father who leaves. Either because he is uninterested or in prison or have restraining order against him.

Sounds like you have an agenda here.