Well that's sort of the point. Tor is special in that it helps avoid this problem, i.e.: given and endpoint, it's (for all intents and purposes) impossible to

Well that's sort of the point. Tor is special in that it helps avoid this problem, i.e.: given and endpoint, it's (for all intents and purposes) impossible to determine whence the traffic comes. At the same time, Tor can be used in such a way that nobody will know it's being used.