It is pretty easy to say the Shuttle or the ISS or Hubble or anything
else was a huge mistake; that the money would have been better spent
elsewhere. Of course, then you would have people saying that where the
money went instead was a huge mistake.

If Mr. Park or Mr. Griffin think those were mistakes, it behooves them
to say what would have been better.

Heck, you could have spent all the money "fighting poverty" (or
ignorance, or injustice, or whatever), and it probably would have been
even less effective in accomplishing those goals.