This is a common countercultural dream, but really quite ludicrous if you think about it. Suppose yr Aunty is ill. Physically. You , having limited medical techniques, are not sure what the ailment is. The sane thing and the rational thing--and really the necessary action-- is to take Aunty to the doctor, to one competent enough to assess her ailments. If you refused to take her in, you would be acting irrationally and in a sense insanely to some degree, if her ailment was severe. To do the right thing, and the necessary act in that context, means to act rationally and take her to the specialist. IT may not be suffciently rational and sane: perhaps you have to go to many doctors, if she had a mystery illness. Not to do so is irrational, and yes counter to most ideas of sanity.....rational behavior is neither necessary nor sufficient for sane behavior.
So within certain contexts--medical, legal, political, scientific--- certain rational actions are required, and indeed some actions would be defined as necessary and sufficient were we asked to define the proper action in that context. Most human actions are goal driven-- one has to know the proper procedures to perform for reaching a goal or desired end. The guys in France who just finished that monumental bridge did not just design it like some painting, without knowing the load bearing qualities of the materials and the right equations given the dimensions and so forth. Within that context very specific and rational actions were required, were they not. I tend to think human interactions could be much more procedure oriented and logical even if that seems cold or not hip.