I don't think this applies to the particular problems being discussed. Certainly it's irrational to discriminate (as you say in a related comment), but the examples discussed in the article are not cases of Scientific American simply declaring that principle, but rather making other errors, or proclaiming a rather different political point of view.

(If you think the "social justice" movement is simply about -- or even supports -- the nondiscrimination principle you mention in a related comment, you are mistaken! And if you support it because you support that principle, I recommend looking more into what the SJers actually believe, because you may find that you're not in as close agreement with them as you assumed you were...)