The point is that we can't determine with certainty that cruel and dehumanising behaviour occurred in the first place. Unless you're willing to investigate the issue further it's probably more sensible to suspend your judgement or at least acknowledge that you're interpreting the article literally and assuming that it's factually correct.
It's not really useful, no. But it's interesting. I read the readme and the five lines of code as a blog post. It makes a couple good points. First, there's no need to reset elements that aren't being used. Second, a reset file is redundant by nature since it's overwriting a "reset" provided by the browser, that's subsequently overwritten by any custom styling. But yes, in virtually every scenario it's more practical to not think about it and use normalize.
Philosophy improves critical thinking and reasoning skills but it requires active engagement in philosophical literature and inquiry. I can tell by your understanding of philosophy as "feeling" based that you haven't done this -- and you're missing out on a valuable form of rational inquiry. No it's not scientific. But to sit back, arms-crossed ready to rebuke anything philosophical because it fails to satisfy the criterion of a different discipline is so contrary to a healthy, open-minded, rational way of living.