[Darth_GW7]

Intent and/or motive is more important than the facts of the crime itself, when determining a sentence.
We have to decide how society will best benefit from the sentence given, no matter what the crime.
If saving these people was a demonstration of the fact that he had repented his previous sins, then what good would punishment do? On the other hand, can we be sure that he will not sink back and do the nasty deeds again?

[ArmageddonScr]

Saving 1 person's life does not allow you to kill one other person.
So why should you be able to kill 1000 and save 1000 and not get (at the very least, very severe) punishment?

edit: oh and murder is murder, period.