Your comment was after mine above. Never? I wouldn't rush judgement. Here is an incident of a lithium battery in a camera bag in an overhead bin causing a fire and subsequent return to departure airport [1], and another of an air-purifier exploding in the cabin causing burns to one passenger and hospitalization of some others due to smoke inhalation [2].
And here's one where the crew of a UPS cargo plane lost their lives due to a fire with rigin located near a pallet containing some lithium batteries in the main deck cargo area. Granted fire suppression was not there I think, but you get the picture [3].
I have not worked in the airline industry, but the above incidents were reported, and were highly-visible, occurring in the passenger cabin. I wonder if there are any unreported incidents of the fire suppression system going off in the cargo/baggage hold? I'll have to read through the source material more.
I know it's speculative, but I say it having worked in a high-risk job where minor incidents like paper cuts and stapler accidents were reported by the front office, but much more serious incidents occurred in the underwater work we did, and did not get duly reported. Safety is a diligence game, and we tend to get jaded by daily 'minor' incidents until a big one occurs and rattles everyone to muster, or it sees the light of the press & public.
