You'd THINK, that if they were so worried about a fire at quite possibly the world's greatest cathedral, they'd have taken EVERY, POSSIBLE, PRECAUTION, NOT to accidentally spark a fire... you'd THINK. But no, oh no, they just came in willy nilly and went about their work not caring if something they were doing that caused that much heat would start a fire, but they did, they just ignored any precautions, and went ahead and caused some sort of enough heat or sparks flying, whatever, by doing something, we don't know what, and they just paid no attention to it and STARTED THE FIRE, and didn't even know that they started the fire.
Nope... not buying that scenario for a second, and if I was the crew and/or contractor, I'd be pissed off that they'd even suggested that my crew and my construction ethics and knowledge were that lackadaisical.