Voluntary manslaughter?

So please tell me how this is different from any other terrorist's justification for their actions:

Sedgwick County District Judge Warren Wilbert ruled Friday that attorneys for [Scott] Roeder can argue that he shot [Dr. George] Tiller to protect the lives of unborn babies -- and, therefore, could be guilty of voluntary manslaughter instead of first-degree murder.

The judge said Roeder could not argue that the killing was actually justified but rather that he had an unreasonable but honest belief that the circumstances justified deadly force.

A political assassination as voluntary manslaughter? Seriously? Yes. Apparently.

no reason

I just liked this.