[stuartcr]

Should it really matter to anyone what someone else thinks of their ethics?

[Mrs. Don-o]

Stuartcr, that's a constituent feature of living in a society, as contrasted being a hermit.

Behavior replicates in a society: by explicit approval, by widespread acceptance, by imitation, by application of its underlying assumptions to another situation, etc.

It's like a sociologial law: it always replicates, unless it is rejected by the opposite means: by disapproval, by widespreak non-acceptance, by practice of the opposite, by the refutation of the underlying assumptions.

So if you don't want to lived in a society in which the killing of innocent human beings is widely replicated, you should make sure it is widely rejected.