I don't pretend to know how to advise you on how you can persuade the public that they ought to trust. I think trust comes when they see that there's been a legitimate process, that there's been a fair and open conversation about it, and that there wasn't a kind of manipulation. I think there's likely only to be a kind of legitimacy awarded to the system after it's been tried a couple of times and people have decided that it works and it works fairly in terms of their expectations and values. They will come to see that it works differently.
It probably won't work very well the first time. There's a lot of evidence that, in the first election in New Zealand, most of the parties and many of the candidates operated in ways that were essentially irrational in terms of their own immediate interests because they hadn't quite worked out how it was going to work. It's an iterative process between politicians and voters, and they're going to have to learn how to work together in a whole different set of institutional incentives and constraints. There will be a lot of uncertainty. There will be questions about legitimacy and effectiveness, but that's inevitable in any fundamental institutional reform. I think the best you can hope for is a process that is open and that's as transparent as possible. I would think things like a free vote in Parliament would go a long way to sending a signal.
Questions about referendums are going to be difficult because there's a widespread view that this is important. Then there will be hard questions about what would count. Would a 50% majority in a referendum count? What if everybody east of the Ottawa River voted against a different electoral system and everybody west of the Ottawa River voted for it? Then you would have a kind of legitimacy problem.
That's why, of course, we had this extraordinary double standard in British Columbia. I don't know if it's the right one, but there was a perception that 50% wouldn't work if all Vancouver wanted one thing and all the rural areas wanted another thing. There are real challenges.
Again, you need openness, transparency, and working through a process that's understood to allow all those viewpoints to be somehow weighed and balanced in what inevitably will be a series of trade-offs. Nobody's going to get all of what they want in this process. There ought not to be a process in which everybody can get what they want, so what you want is a process in which the trade-offs are seen as fair and reasonable and in accord with what people understand to be decent.