Unless they took extra risks to hedge against the string of failures continuing. "Yes we blew up three times in a row, but this time we meant to do that, so it'

Unless they took extra risks to hedge against the string of failures continuing. "Yes we blew up three times in a row, but this time we meant to do that, so it's a success" sounds an awful lot better than "We did everything we possibly could to prevent it from blowing up this time but it still did"