I'm not saying that it's not a citizen's duty. That's not the issue, though. The issue is whether there are other ways to do it that do not compel.
There are a number of things we could compel the citizen to do. We could compel the accused citizen, for example, to testify at a trial, to allow a judge to question him. That would also save time, save money, and make it easier for the prosecution. We don't do that in Canada.
Where is the dividing line? That's the issue.