I've wondered if one could arrive at a good decision using no evidence or facts , but only based on how the different sides debate the issue. The idea is you could determine which party is right based solely on how they say things, rather than how strong the evidence is. You look at how different parties debate. You then compare their styles or types of arguments with debates from the past that have since been settle…
I've always held that the person that is the most angry is the one that is least sure of his position. It's not useful as the only predictor, because people's emotional involvement in ideas can vary, but I find it to be useful meta-information.
Side 1: Language x sucks because of y!
Side 2: While it's true that x potentially sucks because of y, y is easily mitigated by z, and y still offers benefits a, b, & c that most other languages don't.
Even if you have only a shallow understanding of the argument, it's easy to see that in most real-world arguments Side 2 should win.
It's related to who gets angriest because people usually get angry because they have run out of other options.