People don't just kill because they feel like it. People kill because they are in pain. There is a source of pain there that needs to be addressed. Once the person addresses that pain, then they begin on a process of healing.
I don't see how it is the parent's fault for their kid killing someone. It is not just the parents, it's the killers entire surrounding atmosphere, a series of interactions, that led up to that point.
That's the thing is that I don't think compassion and love can be exhausted. Love is infinite by nature. And I would like to point out that I truly live by what I say. I have talked directly to some of my perpetrators. Through my compassion and love for them, they realized what they did. They realized why they hurt me, why they did such a thing, how they got caught in a cycle.
Sending people to boot camp doesn't help them realize the wrongs they have done. Boot camp is not a catalyst for self-examination and self-questioning. Compassion and love lead to those, and lead to an awareness that actually breaks the cycle.
That right there is my solution. I have employed it before and it has worked beautifully.