I think there's so much politics and trenchant resentment about the restoration in certain quarters that people will believe anything that paints O'Kelly in a bad light without checking if it's true or not. For a lot of people the use of concrete at Newgrange was spiritually indefensible even if it was, in engineering terms, the only way to keep it open. They forget O'Kelly also removed as much of the earlier cack-handed concrete supports inside that he possibly could.