What is critical in human living is to  live by a logically logical grammar.
This grammar is the  logic of the society and culture in which we live.
The logical grammar of human society is not universal but unique to its culture within, apparently certain parameters of universal law. Thus:
a. there is no society that we know of in which the taking of the life of one of its members by another member is not taken very seriously.
b. in all societies, disrespect of one member to another is never taken lightly.