To be honest, he is not that left. Miyazaki is more apolitical, anti-political and certainly anti-dichotomy (See Mononoko…) so you can’t really map him on a left/right scale.
A philosophy like that can’t be expressed in simple quotes and statements or the kind of interview modern media does. So he doesn’t, and he avoids it. Miyazaki also clearly stands (no, flies, in a rickety plane) miles above a silly argument about sales ranking or cheap criticism of other people’s work.
I love and adore the man but… watching his movies is probably way more fun than hear him nattering on about things like that, right? 
