[DmenshunlAnlsis]

My guess is definitely Why, then, are younger people more likely to be uncertain or ambivalent? Perhaps they are more likely to offer frivolous or ironic responses, as Earther’s Brian Kahn suggests...

I think the concept of honestly answering pollsters was in decline before the Millenials came around. The idea that a statistically singifcant fraction reacted along the lines of, “why are you asking me such a stupid question, yeah sure, I have doubts, hehehehe...” seems plausible.

[alexgmcm]

Yeah - I remember in the 90s loads of people put their religion as Jedi in the UK census.

People just like to take the piss.

[BrandoElFollito]

I also think that when you have questions such as

- is shroedinger equation valid, or

- is global warming increasing over the last 100 years, or

- is genetic therapy a fact, or

- is the earth round,

I would be quite happy to state that it is actually rhomboid, since you are asking

In other words the question is so silly that people will answer silly, just for the fun of having somoene come out with a scientific analysis of the nonsensical answers.