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Re:Making Humans a Multiplanetary Species [video] by martindevans on Tuesday September 27, 2016 @04:48PM (#12593049)
That presumes that the negative comments are always the ones derailing the discussion. For example:

"I think these questions at IAC are great, it's good that people get a chance to <self promote thing> at a technical conference"

"Wtf is with these stupid questions at IAC? They should be asking about <fascinating technical detail>"

Re:Making Humans a Multiplanetary Species [video] by CalRobert on Tuesday September 27, 2016 @05:17PM (#12593310)
Hah, you just described the sheer drivel which is comments on LinkedIn stories. Good point - contentious and _well presented_ negative arguments are still helpful.
Re:Making Humans a Multiplanetary Species [video] by hx87 on Wednesday September 28, 2016 @01:25PM (#12599513)
Then perhaps use sentiment analysis to remove the derailing part of both negative and negative comments?

i.e.,

"I think these questions at IAC are great,..."

"...they should be asking about <fascinating technical detail>"