I think at least part of it is that ‘Acirema’ is way more recognizable as a variant on ‘America’ than is ‘Nacirema’. The ‘N’ is a major decoy, while ‘Acirema’ has the same word shape (“The theory holds that a novel bouma shape created by changing the lower-case letters to upper-case hinders a person’s recall ability.”)
I think at least part of it is that ‘Acirema’ is way more recognizable as a variant on ‘America’ than is ‘Nacirema’. The ‘N’ is a major decoy, while ‘Acirema’ has the same word shape (“The theory holds that a novel bouma shape created by changing the lower-case letters to upper-case hinders a person’s recall ability.”)