You're arguing that lots of people can spoof this, the other guy is arguing that nobody will know it can be spoofed so it will do more damage. But these are contradictory -- if fakes become common, then they will also become common knowledge. The impact of any given fake is reduced if there are more of them. The technology doesn't need to provide 100% assurance. If it adds even a little friction to the slop mills then that's increasing the signal to noise ratio.