It also sets up conditions by which people have no choice but to make a choice which is in their own interest, rather than having a political process built on vote suppression, non-participation and the kind of clientelism which arises when politicians are more concerned with energizing their own base than expanding their appeal.

Quoting political scientist Waleed Aly:

"In a compulsory election, it does not pay to energize your base to the exclusion of all other voters. Since elections cannot be determined by turnout, they are decided by swing voters and won in the center... That is one reason Australia’s version of the far right lacks anything like the power of its European or American counterparts. Australia has had some bad governments, but it hasn’t had any truly extreme ones and it isn’t nearly as vulnerable to demagogues"

I think your point about compulsory voting creating ripe conditions for more propaganda is not borne out by reality - the USA is just as flooded with fake news as Australia.