They think that improvements should be made, but when, say, the time comes to vote they won't bother taking 10 minutes to see where their representatives stand on this issue and vote accordingly.
IMO this is backward. Representatives should choose their issues by the voice of the people, or people should vote on issues and the appropriate candidate suggested automatically.
We will always get suboptimal results when people are forced to commingle their opinions on everything from science to security into a single binary choice.