I believe there are laws against the kind of discrimination the comment talks about.
The reason is just.
The reason is excellent.
We fear that if not for these laws.
We may find out more about human nature than we care to know.
It helps maintain the farce that racists, homophobes, nutjobs are in the minority, and I will freely admit that I fell into both the first two categories at one point in my life. So in an argument I know my opponent's weaknesses, having suffered them myself.
Until these laws condition the population to be tolerant they will remain and maybe even after that so that mankind doesn't regress into discriminatory thought.
Is this right or wrong in the philosophical sense? In the practical sense? That is what I ask you.