I think the argument a few posts up was that this is the humane way out, rather than dragging themselves or their loved ones through the burns, trauma, radiation poisoning, starvation, and/or depredation that they assume comes next. Having loved ones is not a counterpoint to this sort of thinking.
I can't necessarily imagine making these decisions, but it is not unprecedented that parents would do so for themselves and their children. It's happened with much less trigger than a nuclear holocaust.
