Whether you are responsible or not is distinct from whether it will do a good job measuring what you want it to measure.

Responsibility changes the meaning of the word 'good'. If I design something to measure Y I have a higher standard for 'good' than when I search for an already existing measure of Y.

If people who read the post say: "I don't think IQ correlates with the answer of that question" that an answer that moves the discussion forward.

If they say: "I think IQ correlates with the answer to a differently worded question about global warming" that also moves the discussion forward. We can test that hypothesis in the next census.

If you don't like IQ as proxy than we had the CFAR questions in the last census to measure rationality. They are also not perfect and we can think up a better metric for the next census.