For many it was difficult to accept the South Vietnam government because it was based on monarchy and it was allied with the former colonialists.
Step-by-step explanation:
The conflict in Vietnam started off as a conflict between the North and the South, with countries like France and the United States getting involved later. Lot of people didn't wanted for the South Vietnam government to take control over the country and there were two main reason for this. One reason was that the South was allied with the former colonialists, and the other was that it was based on monarchy.
For lot of people it seemed absurd and unacceptable that someone tries to claim power and win over the people by allying with the former colonists of the country. The people suffered greatly during the colonialism and they didn't wanted to experience the same again. The other problem, being based on monarchy, was not acceptable for the people as it was going to create a society where one person/family has absolute power, while everyone else will have to submit and have peasant lives and live in poverty.