[mhb]

Could be many things. Did they consider whether the incidence of seat belt wearing has decreased? It doesn't seem that far-fetched that compliance with the directive to fasten seat belts has decreased along with respect for authority.

[interestica]

Interesting! As a continued hypothetical, it's interesting that the "No Smoking" permanently-lit sign is next to the seatbelt one. It's a weird contradiction: by being an electronic illuminated sign in the most prominent area (like a passenger HUD - reserved for critical info) it is given an elevated importance that doesn't really align with user expectation (is it really on the same level as the 'alert' implementation of the seatbelt sign?). So, there may be some kind of "cries wolf" subtle psychological effect in play: the cigarette signage is so obviously unnecessary in place and prominence that maybe the seatbelt signage takes on some of that cognitive placement (and implied importance) in mind. I think it kind of plays into that "respect for authority" you noted -- not unlike the possibility that programs like DARE that tried to group drugs like marijuana with heroin may have caused an increase in harder drug use when people realized that they were misled by that initial 'noble lie'. (See also mask use during the pandemic)

[graemep]

I wonder why they have it at all. Every flight I have been on for a very long time is completely no smoking.

I think it may have that effect on the seatbelt sign, but is it greater or less than when the no smoking sign was actually worth checking?

[curt15]

Respect for authority has decreased?

[mhb]

yes