I was def of the opinion that neolithic burial was pre-empted by exposure to rid the skeleton of its flesh and stuff before burial and concur!
Some may have died as a result of an arrowhead, but only 3 out of 14? my maths says that's not a massacre, more like a skirmish. You'd have to date all 3 murders and place them on the same day to prove it though, so I think that's conjecture.
As per my reply to the slumpystones excellent comment on silbury, English Heritage is an anagram of 'ethereal sighing'.
I'm off to Waylands to start a fight with some Archaeologist's, now where is that long bow I had ..... :-)
Wysefool