If we are irrational then why interactions on digital creations demand for rational cognition?
Rationality and human minds do not go together. Rationality is an artificial garb of explanation purported by "experts" to give an impression that they "know what they are talking about". Expectation of rationality abound to such an extent that irrationality is not even considered when designing digital artifacts. The behaviour is more often "forced" on users when they use them. The accommodation of digital artifacts is not designed to support users at all. For example: this very website!
It is important to allow for emergent behaviour to occur on digital artifacts as "irrational humans" are interacting with them and not "goal-oriented robots"!