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Those are all factors. Doesn't change the fact someone forgot to press a single button though.
As to fire wardens etc., all of this costs money, which in cases like the restoration of historic sailing ships tends to be a bit on the tight side, and skimping on it at least generally does not put lives at risk.
SwissChap
Or rather, an idiot management structure that didn't provide the resources for fire wardens that would walk trough the site at regular hours removing flammable debris, carrying redundant gas canisters off the premises, checking that electrical equipment not currently in use was shut off, controlling that extension cords weren't overloaded etc.
And the vacuum cleaner operator in question might have been interrupted mid-way trough his task by a tyrannical middle manager and not even given the chance to go back to turn off the machine. S/he could have been on a zero hour contract with no chance to come back the next day to shut it off, and lacking a chain of command trough which she could report that the hoovering was only half done. Erratic management on work sites is not unheard of.