SJ,
For me, the guilt I have for putting my children in harms way is one of the tougher points I deal with. From the framework of domestic violence, or more appropriately intimate partner violence (happens a lot with same sex couples and researches are only beginning to acknowledge this), the dynamics of the relationship and the mindset of the victimized partner have shed a lot of light on the "why" of my response. Also, the dynamics of a violent relationship are not limited to the primary victim, but effect the dynamics of the entire family. The way control is developed, maintained and then even extended through other family members is eye-opening to say the least.
With that said, it is important for everyone to understand why they acted the way the did, in order to develop healthy relationships. The biggest lie that I ever bought into was I could protect my children from HIM. By giving him more control, I allowed him to have a greater power and influence over our entire family.
So I cannot undo what was done; but I can work based upon my experience to break the cycle with my own children and work within the community with groups that help of people break the cycle.