You obviously just don't get it. It's been explained here very well, and apparently you either don't want to get it, or you just like to argue. Just remember that it's exactly your thinking that is holding this crusade back.
One more time, the official or legal name, however you want to put it, is one thing. Branding for athletics is another. And the politics of this state (most of which is tightly tied to LSU) are not going to let that change anytime soon. The prestige of your degree, and perception nationally, something that could be a big benefit to you in your lifetime, is highly affected by the recognizable "name" of your school. And athletics is THE most recognizable advertisement for it. Again, if you're too thick-headed to realize it, then there is no need for further discussion. And to your point of people jumping up and down to fight for it, they are doing so to aid graduates of the university. You think that makes "us" look petty and are embarrassed by it, then you probably don't deserve the benefits of it later on in life. Hopefully, some day you will realize those benefits and be thankful for those that "fought the good fight" for decades. Or maybe you won't.