Guardian: Rooftop protests at the Palace of Westminster were intended to highlight a conspiracy between the government and Heathrow’s owner over building a third runway, campaigners told a court yesterday. Five members of Plane Stupid, who threw paper planes and dangled banners from the roof after breaching security in February, said they had protested in order to prevent a greater crime. Leo Murray, one of the five, told Westminster magistrates that documents obtained under freedom of …