An irrational world is one where the short term benefits of dishonesty do outweigh the long term benefits of honesty. Whether you feel you live in a crazy world or a sane world then becomes a matter of scale, of the span of time you can watch for justice to manifest and work itself out.
But if you are not an optimist or you are not passive, you might bring justice sooner but it will be according to you particular judgement. The utmost restraint is needed then: little guarantees that swift justice will be rational.
It has been my good fortune to encounter the world as mostly rational.