X is a huge country. Y is a small island/peninsula nearby, with shared cultural roots, but very different recent history (decades to centuries) and different government & economic structure. People living in Y are free to leave Y and move to X. Then I think it's better if Y continues to exist.
Even if Y is worse on some measures, e.g. if it were Y that had an "authoritarian regime that has no rule of law, president has self declared perpetual status ", then I'd like it to continue. It's good to have a diversity of approaches to problems. Even if Y gets 90% wrong, maybe it discovers something in the 10% right, or maybe it's just an interesting study in what not to do. Its people are (by assumption!) free to leave, and have a culturally similar neighbor that will take them.