I haven't read the whole thread:
But yes, urine IS steril. (No I won't find a link for you 'cause you can do it yourself) BUT...urine IS an excellent breading ground for bacteria. Hence, if really wanted to you could ingest your own piss and be fine. Just don't let it sit out for very long. :Q
While I do agree that everyone should wash their hands after using the bathroom, sometimes I'm in a hurry. (Yes, that much of a hurry) And I'm not gonna wait in line to use the hand dryer or paper towels. (Besides, I think those cloth towels that are on big continuous rolls are pretty damn gross alot of the time anyway)
I don't urinate or defacate (sp?) on my hands and I assume you don't either. If, by some odd chance, a drop of my urine gets on my wrist and I feel it, I'll be sure to properly wash it. There's really no need to be paranoid.
If you think this is bad then consider how bad the ear pieces of public phones are. I know I don't use a que tip before I use a phone. Or the mouth pieces of pop cans: those cans have been touched by so many people during manufacturing and distribution it'll make your mind spin. Imagine how nasty it is everytime your brush your hand against some gum someone have left stuck to the underside of a table. Do you freak out and sterilze your hands when that happens to? 
Here's another thought. Everytime you have sex you do realize that there's not an incredible amount space between the girl's vagina and anus right? By using underwear, especially thongs, she effectively bridges the gap between them. I know a few girls who have gotten kidneys infections because of using thongs on a regular basis. They wear a thong, do something active, sweat onlys aids in the travel of bacteria and other things. Now, remember, you're going to put your schlong into the area, maybe even do some cunnulingus? (sp?)
I'm just saying, if someone doesn't manage to wash his/her hands after using the bathroom, there's plenty other things just as bad, if not worse, that you subject yourself to everyday. So.......
<italian mobster accent>.........Forget about it.     </italian mobster accent>