From The History of the DeCSS Haiku:
Finally, I felt that expressing the fear of censorship directly and repeatedly within the poem itself created an interesting tension. It emphasized that the poem had really been written by a human author with a human voice and his own interests and passions. Aware of the prospect of censorship, the poem confronts would-be censors directly and takes them to task. By contrast, most source code is relatively defenseless: it can't fight against its own suppression, and it gives less direct evidence of being in a human voice, leading some people to accept its stigmatization as "merely mechanical" or "merely functional".
—Seth Schoen (link)