Bingo.
The argument is that if a policy doesn't solve the entire problem, or help every single person affected by the problem, then the policy is bad. So instead of funding an insufficient policy, the solution is to... do nothing!
Samuelson's a good example of expertise gone wrong. He knows more about economics than I ever will, but he frequently uses such bad logic that I can spot the flaws anyway. Knowing he's willing to be that disingenuous on a regular basis pretty much kills any trust I'd have in him, so even if he says something plausible, I'm not inclined to believe him.