I think you missed an important point, there.
The main focus of what dylan623 has to say is not about Linux -- it's about GNU. It's obvious, from other postings, that dylan623 is a pretty hardcore GNU/FSF advocate. If the most popular GPL-licensed OS was CP/M, I'm pretty sure dylan623 would be talking about how miraculous and trustworthy CP/M was rather than how miraculous and trustworthy Linux is.
It's useful to recognize the difference between a Linux advocate and a GNU/FSF advocate.