Very well put.
May I see your sources?
For you, and for those who find militaristic uniformity to be inclusive, it creates a sense of belonging. For people who prefer to be free-thinking, self-dependent individuals, it creates a feeling of absolute exclusivity and a feeling of being trapped because it makes you look just like everyone else, and there are many who would disagree with the theory that it brings people together. Teenagers, pre-teens, and children will still form cliques with people of similar interests and one or two major leaders (it's a pack instinct held by humans), and when that happens, there will still be people left out because they're "strange" or "creepy," and then where will they run? In that very act, you have the beginning form of a high school shooter.
And I attend a non-uniform school, and still focus thoroughly on my studies. Sure, many public schools don't necessarily have a higher GPA overall, but that is because public schools accommodate the people who's parents don't push them and it accommodates low-income families who don't expect anything but a fry-chef out of their children. Uniforms do not necessarily mean better grades because of motivation; more often, it means that the students are pushed by their parents because their parents are the people who made their own way to being as wealthy as they are to afford private school and a uniform for their children.
As for the "proven study," I would love to see your source, and "I heard it somewhere" is not viable in this. You might love your uniform, but many people find uniforms to be quite restrictive to the development of an individual personality with abilities that allow them to think freely. Many of the students who love their uniform schools do not thrive in college because they don't have that "immediate inclusion" that a uniform "provides." Students who have never been in a uniform school hate to lose the freedom of wearing their own clothes that they chose to wear for a stuffy uniform they must wear in order to avoid detention, suspension, or expulsion.
As for me, I'd take expulsion to wearing a school uniform.
I would also like to see his source. Public schools are actually as safe as uniform schools, and I'm sure there have been shootings in uniform schools, too. Don't forget that teenagers and children will not change their personality to be more accepting based on a piece of cloth. They don't normally do it in public schools, and they won't do it in uniform schools. I refer back to my "pack instinct" statement above.