Should any voter, young, old, Irish, or Kardashian fail to comply with a simple act of responsibility in ensuring they are registered on the electoral roll a couple of weeks before a polling day, it is a reasoned choice.
It is highly likely they are somewhat intellectually challenged to enable the casting of an informed Vote.
Similarly those imprisoned on polling day, the very high bar to become sanctioned by imprisonment is again an serious indication the cogency and soundness of such a vote is in doubt, particularly when a round half the candidate policy on offer is highly indicative of a lax attitude to any punishing of aberrant behaviour and thereby a tainted vote.
Cease with the crocodile tears if the vote is diminished as a belief in true democracy resulting in low rates of involvement in the system nothing more nothing less, just leave such basic citizenship and personal responsibility to those who do value their democracy.
No Minister 
I am with you GD.
When I was approaching 21 I was left in no doubt by my parents that the first thing I had to do was get to the Waipukurau Post Office and get the forms needed to register to vote so I could put them in the post the day I turned 21
It was the law then and it is the law now for those turning 18.
There are now two big differences these days:
Once enrolled then all you have to do is make sure you change your address when you move house and decide whether you will take the time on a sunny, wet or windy day whether you will vote. In fact you have a couple of weeks these days to pick the day you will get your lazy arse off the couch and go and vote.
It doesn’t get much easier and conducive to casting a vote these days.
In 2020 the sheilas of New Zealand, without a single honest thought between them, voted a vacuous, dishonest, lazy bunch of social and economic vandals into power in New Zealand, giving them a three-year dictatorship with which to destroy New Zealand. Unusually, for that bunch of racist wokesters, they succeeded in their mission.
How is that a good thing?
Voting is not, or should not be, either a privilege nor a right.
It MUST be a responsibility.
As such, registering to vote (and, indeed, the voting itself) should be made difficult enough that only those who have a sense of responsibility will do so.
Otherwise voters will put into positions of power complete and utterly incompetent wankers such as Bolger or Clark. Hell, maybe even the communist cunt if they’re really stupid.