Because it isn't. Illegal copying is wrong and reprehensible, but it is not
theft. It is infringement. The concept of infringement is much less clear
to most people's moral intuition than the concept of theft.
[I have directed followups to net.legal]
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Jim Olsen ...!{decvax,lll-crg,mit-eddie,seismo}!ll-xn!oswald!jim