Do I need to have lived in Nazi Germany to talk about the crimes of the Nazis?
I'm not from the US and I'm a vocal critic of US governments, past and present. But even if I was American, the actions of the US government wouldn't be something it was within my power to change and wouldn't be relevant to what Duterte is doing.
Adopting the rhetoric of the Stalinist USSR isn't helping your case here: https://en.wikipedia.org/wiki/And_you_are_lynching_Negroes