Generally, Thai university students like their uniforms as they identify the student immediately according to the badge they wear, and distinguish them from students from other schools and are thus a source of pride and friendly rivalry. For example, if you're a student at schools like Chula or Thammasat, both of which I have taught at, you are immediately identified as the best among the country's students. Chula as the #1 elite university in the country has a distinctive uniform that separates it from all other university uniforms in the country.
Since the concept of the group dynamic is all important, uniforms simply serve the purpose of reinforcing this. Notions of western individualism are simply a foreign concept here and wouldn't really work well on Thai university campuses.