Millions were upset at the results of WWI and the effect it had on society. The quick rise of modernity and industrialization was overwhelming to a quickly changing populace and unemployment was on the rise. Generally people wanted something different because it seemed like the world was on going crazy.
That would be True. They did indeed start a uprising
This is true, not having a navy has shown itself to be a weakness of many nations/civilizations in the past. And there are also good reasons why this is so. Not having a navy strongly impacts a civilizations ability to maneuver around certain points and go around them. It also limits the ability to trade with other natons. Not to mention the additional value of having the firepower of ships (those that had cannons later on at least).
Because ideology is an important factor in determining how people make decisions, and it’s moral aspects make us more aware of the world and the different personalities on it