It’s your non-mandatory voting.
Don’t blame the internet, which serves other countries well. Blame your special political system for incentivising the rise of extremes over the rise of politicians who “have” to care about the majority.
And plenty of those are not exactly examples of good governance or non-extreme politics. (Ex: Brazil).
So I don't feel your claim is very well supported by the evidence.
Erm, no. What actually kills voter turnout is lack of polling venues. If voting were a quick, painless process on a national holiday, we would see much higher turnouts.
As it is, the current situation is so bad one can't help but think it was purposefully engineered to be that way. Voting should not have to take hours due to lack of venues.
Hopefully mail-in ballots will become the norm, allowing people to vote easily without having to go to a venue.