That person is not a liberal.  Wanting all Mexicans killed on sight is
not a liberal position.

  I came across mention of that kind of thing in some science mags
  awhile back. Autistics can't "go with the flow" quite so well,
  don't see the 'gestalt',  and instead take things apart. They
  typical trick of inserting an extra 'a' or 'the' in a sentence,
  generally on a seperate line, doesn't fool them. WE see the
  sentence as a complete idea, almost as if it was one word, but
  the autistic sees it as distinct individual words - which he
  may have considerable difficulty assembling into a single idea.

  There was a related story of an autistic who went to see a
  psych prof at a universtity once a week. Sometimes he would
  navigate to the correct room perfectly, other times he would
  get hopelessly lost. The question was why.

  It was eventually solved. If he arrived at the same time of
  day as when he was first brought there then he'd navigate
  properly, but if he was delivered at an earlier or later hour
  the shadows would be different and the scene would be totally
  unfamiliar, as if it were a different campus entirely. He could
  not "abstract" the scene and filter out irrelevant nuances.
  EVERYTHING was "relevant" so far as he was concerned. One
  thing out of place and he couldn't cope.

  He  was following a precise 'map' in his head, a landmark map,
  but the details had to line-up perfectly or he could not identify
  the landmarks. It's as if you asked directions and were told to
  go down two blocks and turn left at the blue Wachovia bank
  building ... but the bank had been re-painted yellow last
  week or the speaker was mistaken and it was really a  Bank
  of America. You'd be looking and looking ... but it would
  take quite awhile to suspect the truth and compensate. The
  mental image, 'map', the direction-giver put in your head
  would not be easily altered.