This is a question involving two factors:
1. The social nature of self which has evolutionary advantages for the species, and is reified locally by a common language
2. The inconsistency of self which an aspect of changing states of cognition.
The first involves social responsibility and the concept of culpability. The second involves "living with oneself" as a committee of argumentative personae
The argument is further complicated by religious angles on "free will" ( versus philosophical determinism) and philosophical angles on "living authentically" (Existentialism).
My answer to your question is that it is simplistic, but that factor 2 "living with oneself" is the domain in which the question has any significance.