I get what you are saying, but I'd take TP over the bum gun any day of the week. Lived in Thailand for a couple years, and was a bit shocked when I noticed no TP in many (most) bathrooms, until my co-worker explained it to me. Yeah, it definitely gets your underparts cleaner, but at the expense of your hand -- not everywhere has soap.

If you are using TP, unless you have pretty bad technique, I don't see how you can get any refuse on your hands.

I'd take my risks with a co-worker with a slightly unclean bum using TP, over one with poor hand washing habits that's using a bum gun.

However, I live in Japan and find the washlet to be the happy and cleaner medium. Also, no thanks on the communal arse rag.