The site asks for a login, so I can't read it. If what you're saying is true, that's simply ridiculous! How is it even legal to sell an OS that can get compromised from visiting a website, and why is the manufacturer not liable for that?
That's odd. No login required here.
Microsoft are too big to fail. Their operating system is recognized and used by most of the western world. When it comes down to user safety versus profit, Microsoft will choose profit. While the responsible thing to do at this point is to terminate Windows and build a new operating system from scratch, Microsoft won't take this kind of action. The same thing is happening to Apple, however it's harder for the user to see it happening and the age old "apple can't get infected" myth is still believed by the wider users of Apple products.
You are right in terms of business and security. I'm not even going to debate that point.
But, back to the same thing, to start this type of attack, the user will need to have at some point something that exposed him to the situation. Many still continue to use pirated OS, continue not to perform updates, not to mention using pirated software. If the person does not meet the basic requirements, no matter what OS he uses, he will be exposed to the same kind of problems.