Universalism and universal truth are not the same thing. Truth is universal. It's universally true that 1+1=2.
Universalism is the idea that a society should be geared towards all of humanity rather than the group of people who comprise it. This is where the problems start.
Universalism is the idea that a society should be geared towards all of humanity rather than the group of people who comprise it. This is where the problems start.