>"I hypothosize that I already know my own opinion"
I think part of the reason for hiding the points is to affect the process of forming opinions and better facilitate changing opinions already formed - I doubt that the use of scores to confirm one's own opinions is seen as beneficial to the community. For people who believe that scores should reflect the quality of a comment rather than the popularity of the sentiment it expresses your argument tends to support the hiding of scores.
I think part of the reason for hiding the points is to affect the process of forming opinions and better facilitate changing opinions already formed - I doubt that the use of scores to confirm one's own opinions is seen as beneficial to the community. For people who believe that scores should reflect the quality of a comment rather than the popularity of the sentiment it expresses your argument tends to support the hiding of scores.