LEt me try to be more clear: "soul" damage or damage to your character is the least of it. If the killing is sanctioned by self defence or by being a soldier, cop etc, of course it is muchless tho not always as we know. but if you are an ordinary citizen, not street hardened, not a social enemy, and you cut/kill someone you will: lose years of income to lawyers fees, be put on public display in court any number of times, spend a variable length of time in jail depending on your finances where you will have to 'befriend' some people you would never have to taked to before, just to survive, your life and relationships with friends and family will be aired in public over and over and over - you will become a spectacle. I'm sure each of you could add something to this list and this may all happen even if you are eventually found not guilty. If the family sues you, you will loose your chance to go to college, your chance to own your own home etc, or you will have a bancrupcy on your history. You choices will be different than they were before... A judo man in town here walked away from a bully in a bar but got jumped outside. He threw the idiot over his shulder, broke his neck (accidentally) and he died. He spent months in jail. His family morgaged their house to make bail and to pay the defence fees. The media made a circus of his life and his girlfriend. After 4 or 5 years he was declared innocent by s-d but he was by then clinicly (sp?) depressed, couldn't hold a job, and left his girlfriend and family and left town. Use a knife and all this will be much, much worse. That's my point... If you think the nice policeman at the scene will say, "there, there, obvious s-d, go home, we'll have some questions in a day or so, stay cool", you watch too much tv.