My parents had sex which resulted in me being born. They raised me according to the mores of their culture. I met a woman, had sex with her which resulted in my

My parents had sex which resulted in me being born. They raised me according to the mores of their culture. I met a woman, had sex with her which resulted in my children being born. We raise them according to the mores of our cultures. I do not need anything more - nor less - to 'justify' my existence. The real question here would be to whom people would 'need' to justify their existence. That may be a role more suited to imaginary cloud people - ${god} - than to real-life ones who can and certainly will abuse such power to their own advantage.