Sanity does not include one specific moral system. For humans, it also does not include being bug-free given some morality,
What would make you think so?
What would make you think so?
I am fairly comfortable labeling "doesn't mind killing people" as sufficiently abnormal to be called "ill".
Well, once you've thrown away morals, it's true that all you have left is the hope that others will refrain from killing others due to not feeling like it.
Morality is just the portion of goals that humans in a given culture share, but I'm not sure you should be so quick to dismiss it as a positive force.
You're not correctly quoting the parent comment (I'm not sure you're quoting anyone, it looks like you're erecting a strawman), he said "willing to kill".
There is a lot of ground between being willing to kill, for example to save the lives of others, and not minding killing.