Compatibility with all browser and OS environments is the entire purpose of the w3c standards. IE is not a valid standard bearer.
I feel we are moving away from the main point here, and it is becoming more a flame war, the main thing I can say is, my non w3c standard site works in both IE and it works in mozilla, which means that mozilla supports not w3c sites, so in reality, how is this diffrent from IE?
IE supports part of w3c. You can design fully w3c-compliant web sites that work in both IE and the rest of the world. IE also has a lot of junk code that it supports that must be avoided. Do you at least run sites through
http://validator.w3.org/ to avoid major errors?