Aside from the problem with the yes chains, I suspect that a lot of people, when answering “yes” to “do you think that (unusual subject) is a good idea”, mean “to the extent that I’ve studied it, it seems to be a good idea, but I haven’t studied it a whole lot”. They may not, in fact, be certain enough of it to go out and do it, even though they would verbally describe it as a good idea.
Aside from the problem with the yes chains, I suspect that a lot of people, when answering “yes” to “do you think that (unusual subject) is a good idea”, mean “to the extent that I’ve studied it, it seems to be a good idea, but I haven’t studied it a whole lot”. They may not, in fact, be certain enough of it to go out and do it, even though they would verbally describe it as a good idea.