As I have 30 mins to kill before my next Dilbert meeting, I'll add my input:
I'm writing this for a specific group that are open minded to learning other points of view and not rigid in their current ways (I'm often guilty of being set in my ways too)
TP has been around for over 1500 years, in the early discovery of paper making by the ancient Chinese. http://en.wikipedia.org/wiki/Toilet_paper
Running water in ancient Roman bath houses has been around for over 2000 years. So simply because in India it is customary to go without running water and TP, is not a reason enough to dismiss the ancient Romans and the Chinese, and instead favor the Hindu.
Given the option, with negligible weight, I gladly use TP. If I was marooned on a deserted island or trapped in India, then I will improvise and accept the increased risk.
TP weight: the more you use, the less you carry.
Disposing: burning and burying are accepted method at most places. Unless required to use WAG blue bag those are exceptions, in which case the poo is the main weight, not the TP.
I like TP as a barrier to keep my fingernails clean. In my region there's no water sources most of the year. So I have to compare the water weight to hand rinse versus the nano weight of TP.
Now I'm ready for my shiity meeting.