These are the top 3 reasons why I’m against Score Voting, and I don’t hear much about it.
Anyone know if there is something wrong?
Dependence on minority candidates (IWA fails)
Given 2 candidates A and B from opposing factions, the results of the election would be:
If an Ae (minority) candidate with extreme A ideologies had been added in the same context, some voters who supported A would now have voted like this:
Ae A B
reducing the points assigned to A. This reduction of points in A could make B win even if the voters are always the same.
High dependence on results forecasts
Given 3 candidates A,B,C. One voter loves C and despises A and B, but prefers B between A and B.
(1) A and B are the favorites, while C is a minority. The voter will vote like this:
A B C
In this way, even if C loses the vote doesn’t become null in the clash between A and B.
(2) C is one of the favorite candidates. The voter will vote like this:
A B C
(3) There is insufficient information about expected results. The voter will vote like this:
A B[?] C
False predictions about the results could be disseminated, with the aim of making certain candidates receive more or less points (B in the example).
How do you vote?
Given 10 candidates, I consider 5 of them positive (I’m happy that they win) while I consider 5 of them negative (I’m sad that they win). All 10 however have an order of preference.
I vote in the following way:
But if however all my favorite candidates lose, my vote becomes useless regarding the negative candidates, so I vote like this:
But negative candidates are too little away from the positive ones, therefore to favor my favorites, I vote as follows:
But if I really want to favor my positives to the maximum and negatives to the minimum, then I should vote like this:
But to provide a good representation of my interests, I also want to indicate the order of preference, so I should vote like this:
I went back to step 1.
These aren’t tactical votes; it’s only the voter who doesn’t know exactly how to vote.
In the Score Voting:
) it’s not known exactly how to vote.
) high dependence on results forecasts (very exploitable).
) results that depend on minority candidates (very exploitable).
Problems related to almost all Score Voting-style voting systems, both single and multiple winner.