I am not sure what the number is, but when I hear 80% taxes, I think someone (maybe me) is not doing their math.
But I do agree that one must first make sure to understand the argument of the other side before articulating a counter-argument. I think in this case, there is also the problem that the message gets diluted because of the messenger: unfortunately PG does not have credibility in this area because (presumably) he has not been on the ground dealing with poverty issues as many others. Then again, many economists haven't either, even as they also postulate solutions.