I don't remember anyone ever saying that if someone didn't intend to kill that it isn't immoral. more than likely, they did something immoral that caused that death - like drunk driving

the question of intent is important though on a human personal level. with this little thing we call forgiveness. you can say, its immoral to refuse forgiveness for someone who didn't intend to cause harm

I for one, would not like to see a drunk driver gone wrong put to death because he killed someone while behind the wheel. Intention is important in this case.

Accidents, happen. We can't treat them on the same level as intentional harm. I'm not saying that justifies the accident. But neither do the ends justify the means.