They are entitled, and they are likely, to vote for or against a measure because they have a personal interest in it. Members of both the Vermont House and Senate have been denounced over the last few months for not listening to the people. They clearly have listened. But for some critics, the fact that a majority of the Legislature has acted contrary to their desires is seen as not listening. But Linde's point is an important one.
Individuals have only to represent themselves.
They have no obligation to consider anyone else's interest. They don't have an obligation to even listen to anyone else. And unlike elected officials, individuals have not sworn an oath of office that they are meant to uphold. But Broder was not persuaded, and I think he makes a good case for why we're better served by a republican system and strong legislatures.