RE: but the point Im trying to make is that it is NOT a matter of law that it is reqiured,
The quotes I have listed on these pages are exactly from US tax laws.
Regarding some of the other questions you have...
I can't speak on behalf of the folks who ignore them, but they are in fact US tax laws.
Please feel free to add to one of the above two posts if you have additional questions.
Regards from your forum moderator