Standing for the anthem is a sign of respect and patriotism in the eyes of many, but it is only meaningful in that way because people choose to display that respect or patriotism. If you taste away the choice and force it, you take away any meaning it has. No one is being respectful or patriotic if they are doing it because it is forced. It becomes an empty hollow act without any meaning. So by trying to preserve something in this manner, you only destroy what you are hoping to preserve.
-M