We cannot call reality wholly rational for at the very least it has minds in it, which are not themselves, wholly rational.
Now, some might say that minds themselves don’t exist, though I don’t suppose why anyone should listen to someone without a mind, no matter how fancy they should sound.
And that same person, who would say minds don’t exist, at the same time, would still even be inclined to admit, that while those minds themselves may not exist, many of them are certainly irrational, especially if they disagree with such a proposition.
But maybe we could say irrationality is always an appearance, that something rational is always hidden behind it, and that irrational decisions are always made in err, or because of some deception.
And it’s not unlike an old conversation, that people cannot choose evil willingly, that only if they had seen what was amiss, what was obscure, they would have seen clearly, and chosen rightly. Except the terms have been cleverly changed, and rationality has been substituted for good, and irrationality for evil.