How about both? All behaviours are inherently arational, if I can be
allowed to coin a new term. That is to say, they originate through
the interaction of memes which are not, in themselves, governed by any
`rational' means of interaction. The meme-complex "rationality" may
assert dominance in the selection of the resultant behaviour, in fact,
to live in modern society we hope it /does/, but it needn't.
Our /perception/ of whether the resultant behaviour is rational or not
is always and inherently relative and contextual.