Stonehenge and its Environs 134
Image by fitzcoraldo

The best "defence" against the glacier theory (assuming we all have a dodgy non-scientific wish for the "human transportation" story to be the right one, which I do) is to desist from asking "why would the Stonehenge People go all the way to Preseli to get stone?" and to be much more positive about the evidence and to say, confidently - "it looks very much as if the Stonehenge People went BACK to Preseli to get their stone circle".

"Dodgy non-scientific wishes"

Jones calls it the Stonehenge Myth, which just happens to make a good story, he says the transportation of the bluestones requires a great deal of imagination - stirring tales of primitive men hauling massive bluestones on sledges from Milford to the Bristol channel (has anyone seen the tidal reach up the estuary) to the Avon Valley on the assumption that a) Preseli area was a sanctified area, b) that they desired/sanctified the stone type which was used for stone axes. Lot of non-rational thought there then.... what we all need is the Tardis to see what really happened..

"it looks very much as if the Stonehenge People went BACK to Preseli to get their stone circle".
I'm trying to think if there's another example of people moving a whole religious structure from one place to another. I can think of bits of the original structure being incorporated in a new structure (which would make sense here) but not a whole structure being moved.

Anyway, the question is academic because I now know who moved not only the bluestones but all stones everywhere and how (answer at http://megalithicpoems.blogspot.com/ ;-)