«The biggest problem with voting not being mandatory is
that a lot of people don't have the opportunity because
they can't get off work. If you made voting mandatory (or
at least made election day a paid holiday), this
impediment might be alleviated.»
An alternative, as it's done in Spain, is to give everyone the right to leave their jobs in order to vote. To alleviate things for businesses, all elections happen on Sundays.