Exactly! "Reasonable measures" in air/at sea are stronger than on land, where
1) there's usually an option to stand around at a safe distance gawking at the conflagration until
2) fire trucks arrive.

A cigarette ash knocked into the crevice of a seat can smolder for a long time, then flash into major fire under the right conditions (like a high-oxygen environment…). Plenty of older aircraft are still flying whose interiors give off toxic fumes when on fire, too. This is one situation I'd rather see a FA overreact, than underreact.

AC 797 managed to land, and still people died. I miss the music Stan Rogers never got a chance to make.