Agreement or Disagreement comes with supportive explanation to make a justice for the statement put forward by the individual. Most of the time Agreeing or Disagreeing has flavours, these are "To avoid controversies", "personal or collective agenda" and most important fuelling of EGO because some people has to say something regardless of their knowledge about this topic or situation, because these so called "Sentient beings" believe their opinion makes a difference, but in reality it is really not required, similar to my statement made here.
Yeah, but in the case of the social media that rewards for our comment it's a bit different. When someone is always in the hot or trading page, some steemians think that if they will always commenting him/her and agree with everything, they will get the attention from others and be more rewarded. They maybe right about that, but when the creator of the content see such comment and that's people are always telling him that's his right, he feels that they are not understandning the point. It's clear when someone commented just after reading the title and who commented with reading all the content or watching all the video. In the case of 3speak , we make videos here and we like to see our videos being watched, because it mostly take a lot of time from us to create those videos.