Nobody has a moral responsibility to vote. One of the key features of democracy is that people are allowed to express their political beliefs in whatever way they choose.
People fought for this country for many reasons, and it’s absolutely reductive to say that they did so to keep this country a sovereign nation. I have read the army documents from the Second World War that discuss the army’s disappointment that the men were not more ideologically invested in the war, have you?
Here’s a question you always dodge, how would you enforce compulsory voting? What would be the punishment for not voting? As I said, the current fine in Australia is, so far as I can see, 20 Australian dollars, slightly more than a tenner. Are you saying you’d fine people more than that? Send them to prison? Give them a criminal record? What would you do with the people like me who will insist on the right to choose?