The entire premise is flawed. Microsoft gets called out all the time in the press for bugs and security flaws.
Microsoft gets big credit for releasing a patch for many "PC Worms" or "PC vulnerabilities", but the vulnerability in never ever a "Windows" problem.
I tested my impression with data:
Google news searches:
frequency term
--- ---
0 pc worm
5 windows worm
12 computer worm
0 computer vulnerability
2 pc vulnerability
7 windows vulnerability
6 pc virus
35 windows virus
161 computer virus
Flawed premises are par for the course there. (For those who don't recognize the site, it's the old boycottnovell site, with a new name to try to dodge their old reputation).