I clicked through that link and read the comments and the OP actually seemed very reasonable. His wording originally wasn't very good, but he was willing to express his thoughts and invite people to educate him on a subject that can be difficult to relate to if you aren't a direct part of it. He was worried about mental illness, and simply wanted to make sure that people are getting the care they need, even if he was completely wrong. In addition, he actually changed his mind when confronted with a well laid out and logical explanation. His "why?" was a legitimate, if ill worded and heavy handed, "why?"
If everyone could have an open mind and a willingness to put their thoughts out on the table and the humility to admit they were wrong, life would be a lot easier. I think it's important that we remember to be patient with people who are questioning us, even if they are insensitive or mean, because there are a lot of people out there who legitimately have our best interests in mind and just have a warped sense of how we can be happy. We have an opportunity help those people understand and broaden their horizons.
Of course, some of them are just mean, and if you ever need backup with one of them I learned how to punch someone yesterday.