The grand irony as we debate the importance of validation and what web standards are is this little bugaboo:
Web "standards" aren't.
The W3C provides specifications and recommendations which have been coined by practitioners as "standards" when they are not precisely standards, but de facto standards. ISO, for example, is a standards organization with a full compliance set that if not met - well, products don't ship, period. With a true standard, compliance is mandatory. With de facto standards, what we have are browser compliance problems up our collective wazoo.