Re: There are two types of system out there.
@AC- "but one has to admit that if anyone can track, block and prosecute originators of nastyograms within their border, they probably can"
They aren't suceeding in eliminating 'nastyograms', so either they aren't trying, or complete traceabilty is not the solution.
I doubt whether complete traceability is a solution... as you said, you just find a botnet victim. Tracing the next layer requires exponential resources, against an attacker who will always be erasing the evidence. You spend ever more resources chasing an elusive goal. Time to look for a different approach.