In the lead up to the election there has been some discussion about tactical voting: is it appropriate to vote for those you really don't support, as a vote against some other party?
Tactical voting is caused by the First Past The Post system. Proportional Representation would discourage it in different ways, depending on the details of the PR system adopted.
Tactical votes are given for manifestos that aren't really supported, making the murkiness of politics even more opaque. Yet many would prefer this to "wasting" their vote or leaving the door open for a manifesto they clearly oppose.
Interactive Democracy may be operated with FPTP or PR, but voters could then vote for the individual policies they prefer, clarifying, to some degree, what they are voting for or against.