Let's focus on the "meat" of this "sandwich":
"Life...needs NO external sanction or purpose."
When we unpack that statement, while the rest of your comments says there can be a private, a personal, a processional self-purpose for life, what this "meat" of your comment says is:
"Life...needs NO social OR social ethical sanction or purpose."
So do YOU REALLY believe there is no social or no social ethical sanction or purpose within life?
I am not sure what you mean by a social ethical sanction. If you are asking me if I can do anything I feel like doing then no I don’t believe that. I believe there is an objective standard of morality. Man’s life is the standard or to put it another way man’s individual rights are the standard. Man’s rights are a consequence of his nature which is an objective absolute. Anything that violates individual rights is immoral.