Why do we actually think our opinions are important if they change nothing?

Inquisitive3
I was pretty good friends with someone here. I met up with him off of here, joined his group, went of other social platforms. Completely platonic but I felt we were friends. I decided to voice my true opinion on something and he flipped, I blocked him. Overall, there is no point for a disagreement. His opinion changes nothing in the world and neither does mine.
Why do we actually think our opinions are important if they change nothing?
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