Okay so extreme example, you are in a fraternity and the majority of your chapter is for hazing the pledges. Do you voice your opinion and fight this, or do you sit around and watch it happen. Seems like standing up to those people says something big about you. Sitting there and watching people get hazed is the wrong choice.
More realistic example, you are a member of the residential hall association at your school. The majority of people here want to not give non-voting members speaking privileges even though they pay for all of the programs that RHA puts on. Basically, the majority is telling the people in the halls that they can't suggest where their own money should go. Standing up to this is important, and it helps to show that you care about others opinions and want to listen.
Basically, you are right sometimes. If it is some generic example like you don't like some motion passed about parking lot procedures, it is pretty pointless to have an hour long debate. It probably won't affect anyone much and won't really have any negative effect, but some things are worth fighting for, and I think that is what this type of essay can show. Where do your principles lie on some of these issues and how strong are they.