The Unforgiven

I am not much into rock and Metallica in general. I just listen to two compositions by Metallica, namely "Nothing Else Matters" and "The Unforgiven".
Fews lines from "The Unforgiven"

they dedicate their lives
to running all of his
he tries to please them all
this bitter man he is

throughout his life the same
he's battled constantly
this fight he cannot win

a tired man they see no longer cares
the old man then prepares
to die regretfully
that old man here is me

I have not yet been able to find a fault in the old man.