I find it irrational to assume that because you use "thinking" instead of "feeling" you will make more rational choices. The "T's" I know do not make any more rational decisions than anyone else, they just like to think they do.
I have a theoretical mind, I loved thermodynamics, numerical analysis, compressibly fluid flow and control systems design. I can make thinking choices when the need arises.
I've never seen any reason to believe that a thinker has made more rational life choices or is any happier with life because they can "disregard" feelings. In fact, I haven't met anyone who actually is rational.