I actually believe that there is only objective truth, and no "opinions". I follow the works of Kant and Rothbard.
And I actually don't believe that, so there's one example of how people can have different opinions. To bring it back to Sam's point, this shows we don't have a unified view on this
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
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.