I'm not sure if even that is defensible, if a person has conflicting opinions and is in a position of power, they can matter greatly. For example Hitler's opinions on Jews/Gypsies
That has nothing to do with moral or logical truth. Your conment is off-topic.
You specified "moral or logical truth" in response to Hibuddha's question. So I am asking if you were only talking about that subset of true statements on the issue of objective truth.
So was his example off topic? If a person subjective opinion has power to enforce their subjective opinion on others, one could say subjective opinion can matter objectively.