This accords with my experience after fifty years of life, but is not quite a proof that IQ is meaningless. IQ tests estimate a kind of abstract problem-solving ability useful for many real-world tasks, and correlated with life success in various occupations. But IQ is not the same as rationality,

http://yalepress.yale.edu/yupbooks/book.asp?isbn=97803001238...

http://www.amazon.com/What-Intelligence-Tests-Miss-Psycholog...

or, if you prefer this terminology, IQ is not the same thing as wisdom,

http://www.cambridge.org/us/catalogue/catalogue.asp?isbn=978...

http://www.amazon.com/What-Intelligence-Beyond-Flynn-Effect/...

so it shouldn't be terribly surprising to see irrational or unwise behavior from high-IQ individuals, as I certainly have.