My opinions are relevant to my life if they affect my actions. However, most of my opinions I have written about in this book have no relevance to the things I do each day.
I also know that my opinions are irrelevant to the majority of the world. This doesn't stop me from writing them. I write my opinions down because even though my thoughts may be irrelevant right now, there may come a time when they are relevant.
If you live in the same apartment with someone, or you work with someone, or in the worst case scenario, you die and then get stuck with them in your afterlife for all eternity, then all of a sudden, most of what that person does