I don’t see how it should. I’d think that “reasonable” characters would make stories much more interesting. After all, nothing is as entertaining as when an evil character becomes understandably evil and their motivation becomes something that the reader cheers on - especially when there’s the moral ambiguity of, “Which one’s right“

Hmm… good point… I suppose it requires some form of intelligence to plot a valid path of understanding for an unreasonable character. I’m not sure I have the capacity to place myself in the shoes of an unreasonable character, although, I suppose to an extent I’m an unreasonable person, so it might not be that difficult. But then, how does one sit down and say to oneself, “I’m going to make a stupid character” and pull through without being biased? Just let it grow and develop, I guess…

Then again, think of the most unreasonable person you’ve ever met/known and use fragments of their mindsets/personalities as reference? I’m not sure I’d even know where to start. That’s why YOU’RE the writer