I like this as a means to exiting with a message. This will, according to the documentation, call `sys.exit(1)` if it's left unhandled, exactly as we want to.

Note this message is, again, inconsistent. This time, it's with `raise SystemExit("Error: %s" % e)` above. Given the multiple representations we have flying around for error states, I think this can be significantly cleaned up.