Re: Poll: Have you ever questioned why you are training in aikido?
I question pretty much everything under the sun, including whatever I do--not in the sense of "second guessing;" rather in the sense of scrutinizing motives, desires, etc in the name of living consciously.
Often in the process of living I simply make a gut decision based on intuition or on what "feels right" but it is nice to be able to go back, with hindsight, and review the process and outcome.
Also, esp. with long term stuff like aikido or relationships, the "reasons" change over time, and without examination (which may be as much checking in re feelings as it is rational thought) once can find oneself operating by rote, quite detrimentally.