Detecting trolls is important, in other words.
Stating it is reasonable that an individual has a right to choose irrationality removes the leading portion of your question which itself is a removal of choice by those who attempt to answer it. Applying rational thinking to answering it reveals an important question to ask ourselves:
> Why is it reasonable for men vested with the authority to enforce the law for the peace of society?
I think it is somewhat rational for individuals of a group to elect a sub-group to make choice for the individuals. In the case of law, which is suppose to be a rational instantiation of future choice for the group, it is the peacekeepers that are responsible for making choice of who is removing choice from other individuals or the group, as a whole.
However, irrational laws and expectations do creep into the group from time to time. Benjamin Franklin once spoke to this by stating, "Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety."
A corollary to this insight would be: "Those who would give up temporary Rationality, to purchase a little temporary Liberty, deserve neither Rationality nor Liberty."
Edit: Safety equated to Rationality.