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Re:Washington Post integrates Talk – Mozilla’s open-source c... by MarkPNeyer on Tuesday September 12, 2017 @07:45PM (#15234109)
How about this:

separate buttons for "this is a good/bad argument" and "i agree/disagree with this"

then give more voice to people whose votes on these two axes are orthogonal.

this rewards policing bad arguments on your side, or finding good arguments on the other side.

Re:Washington Post integrates Talk – Mozilla’s open-source c... by rocqua on Wednesday September 13, 2017 @07:24AM (#15237219)
If it is known that visibility is tied to "good/bad argument" rather than "agree/disagree", I'd expect most people to start using the 'argument' buttons for signaling their 'agreement'.
Re:Washington Post integrates Talk – Mozilla’s open-source c... by MarkPNeyer on Wednesday September 13, 2017 @01:06PM (#15240269)
it's tied to both.

to gain visibilty, need to vote "good argument, but i disagree" or "bad argument, but i agree with the conclusion"

a naked 'good argument' or 'i agree vote' costs a small amount of karma.

a 'i agree, good argument', costs a large amount of karma, because those votes should be rare.