I think it’s more that just the drive to get more power inherent in any government’s claim of sovereignty over anything. In this case, life is manifestly better, in every possible way, for people in Taiwan than in China, so its existence is a constant rebuke to the quality of the Communist Party’s governance and to their fitness to rule.
If the Taiwanese system were not manifestly so much better than the Chinese one, I don’t think the commies would care nearly as much about it.
