Because it really seems like both are increasingly inadequate systems for handling modernity, and the obsession with defining one as intrinsically evil and the other the obvious superior option (I’ll let you choose which is which) is such a flattening, unhelpful approach.
Personally, having moved from capitalist America to post-communist Poland, a few things seem true to me:
…the communist era in Poland was a disaster and the country today is unquestionably better off as a modified capitalist one;
…contemporary American culture really seems to be struggling under an unquestioned capitalist ethic;
…the conflict seems artificially egged on from think tanks, corporations, academics, and maybe even the simple alliteration of the letter c (i.e., you don’t hear nearly as much about Capitalism vs. Socialism, even though historically that’s a more accurate label of what governments actually were.)
…and that neither capitalism or communism has ever really been implemented in a pure sense.
Which is all a long way of saying that Mark Fisher’s quote seems more true every day, not as a pessimistic statement but just one describing a lack of imagination and the inability to transcend the debate:
“It’s easier to imagine the end of the world than the end of capitalism.”