Not quite sure this works out as nicely as that. Argentina has both compulsory voting and a legal voting age of 16 and it managed to produce Javier Milei (who makes Trump look like Kissinger).
What's the best way to have a sane system? I'm not sure. I personally lost all faith in democracy.
Argentina is notoriously corrupt and suffers from an overly politically powerful military. Not even compulsory voting can fix those. There are dark private forces currently waging war on democracy it will be a catastrophic disaster if they win.
Kissinger was a war criminal with a huge amount of blood on his hands.
> What's the best way to have a sane system?
A start that would not require big changes to our existing system would be open primaries. That would incentivize moderate candidates. Or perhaps eliminate primaries altogether and go with a two-stage general election like some places have for their local elections. Everybody runs, then the top two run against each other (unless one got an outright majority in the first run). Skip the more elaborate instant-runoff styles of voting because that is too advanced for average people.