If you want to transition aterm to rxvt, please target it to rxvt-unicode-256color rather than any other variant. Both rxvt and rxvt-unicode use a weird 88 color palette that's incompatible with any other terminal. Other than rxvt, all reasonable terminals either provide the same palette or at least do best-effort emulation (linux console because hardware reasons). And, there's no way to detect which palette is in use. Fedora and co ship only the 256 color variant, thus let's kill the 88 color one.
Meow! -- An imaginary friend squared is a real enemy.