The odd thing about the world’s dumbest firebomber is, why did he do it? There’s no obvious profit to him in shoring up the curse, since he doesn’t seem to want to charge admission to the cave or anything.

I wouldn’t be surprised if we discovered he was a mook working for someone else. Even then, the ultimate motivation of the person responsible is just as mysterious as why the only modern “spontaneous combustion” case mentioned by the good doctor was the one in which the coroner seems to have been tripping balls. (Well, okay, that isn’t so mysterious—most other cases have been investigated and found to boil down to “cigarette or other obvious ignition source + drugged, drunk, disabled or predeceased victim who couldn’t escape the fire”.)