Bush2000, you're alive! I thought you were banned by now :)
It wasn't a non-sequitir, but I did leave myself open. Let me put it this way, an equivalent set of programmers writing a Firefox, or an IE, will inherently end up with more vulnerabilities with an IE because there is so much more going on at a lower level in the operating system. That's just a logical fact.
If IE were split off from the operating system, it would be less vulneerable to system destroying exploits. Why would I write a crappy Firefox virus when I could destroy western civilization by driving a core through Internet Explorer on every machine?