I will not use Facebook due to all the scandals, but here are my thoughts. You can copy and paste them into the Facebook.
Wow, this almost turned into a rant.
- IRV is complicated and requires upgrading software on voting machines. Score and NetApproval works on today's machines.
- http://rangevoting.org/rangeVirv.html#nasty shows (1) IRV thwarting a clear majority winner, (2) IRV is not immune to strategy or spoilers (if the A camp and B camp rank C above all others, then C wins), (3) IRV can lead to 2-party domination (either C drops out, or both A and B drop out), (4) IRV has a large risk of near ties, and (5) IRV ignores much of a user's ballot.
The eliminations are: E drops (49 votes; one less than A), then A drops (50 votes, one less than B), then C drops (100 votes, one less than B), finally D wins (by a 60-40 margin, although C is preferred to every other candidate by a much stronger margin).
About point 5: Notice that the B voters did NOT have their vote transferred to their second choice OR their third choice, as those candidates were eliminated while those 51 votes were still on B. By the time B was eliminated, the only candidate left was D, the fourth choice of those 51 voters. So next time you hear propaganda about second choices mattering under IRV, think again.
Score Voting avoids every one of these problems. The winner really depends on (1) how happy the left and right are with C, and (2) how happy C voters are with B and D. The race will be competitive, and second and third choices will truly matter. (With IRV, only a select few second choices matter, and those are biased.)
Worried about "bullet voting"?
Ok, so everyone bullet votes. C wins.
Now the DE party decides to vote DE max score, and ABC min score. D or E wins.
Now the AB party tries to retaliate. They vote C a medium score like 5/10, and C wins.
Bullet voting has been defeated.
I have engaged the propagandists at the Voting System Options group.
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If you are arguing against IRV then you can attack Fave Betrayal failure.