Pinera is the first president to truly utilize democracy in Chile. The option of not voting is a political stance in itself, and not allowing citizens to take that stance is a lack of freedom. Like Pinera said, giving voters the freedom to not participate still holds Chile's citizens responsible -- if they don't want to vote, they should at least be informed or have a strong reason to abstain.
It's a shame that with the increase of freedom in Chile, the percentage of voters decreased. Freedom isn't a given, it should be deserved, and the poor showing of voters in Chile shows that maybe they aren't ready for this freedom they have been given. I think the citizens of Chile need to be better informed on upcoming elections and realize that they aren't going to be handed any more freedoms without working for them.
Like Pinera said, if they don't want to vote, they should at least be informed or have a strong reason to abstain.