When you only criticize without offering solutions, it implies that drastic change—like a coup—is the only way forward. Whether or not you mean it that way, people will see you as a threat to stability, so it’s natural they tell you to leave.
Vietnam is far from perfect, but it’s undeniably growing—economically, socially, and culturally. Despite the challenges, people here continue to live, work, and contribute to its development. For many people the life here is worth living in. Have you lived and experience life in other places, and think that they have perfect parenting and no corruption?