Let me say that this is not my standpoint, in fact I agree with you, but I am just attempting to debunk the myth that some killers are better than others. (I am assuming here that they scuttling included captain and crew.)
You bet some killers are better than others.
If I put my life on the line to defend your life, or the lives of your loved ones, and have to take the life of another to defend same, then have to deal with the psychological impacts of it, you bet I'm "better" than the person who intended to harm you or yours.
There's nothing prideful about having to face that. There's nothing good about the actual act.
But there is the reality of Good Men, willing to do Very Bad Things, for Very Good Reasons.