normalization

Collaboration and group cohesion requires normalization of its members' expectations/behaviours/attitudes.
When there is no rational basis for either of two arguing parties to be right, but inexplicably, they both agree the "truth" needs to be determined and enforced.
They can:
(a) each hold their respective positions, agree to disagree and live parallel lives, forever guarded and cautious of not crossing each other's paths for fear of offending/insulting each other;
(b) agree to codify that blue is last, with exceptions made for purple, keeping bureaucrats, lawyers and journalists gainfully employed and future generations perplexed;
(c) recognize that the colour sequence is really a non-debatable personal aesthetic issue, ignore it, and move on to higher order needs for collaboration and social cohesion; or
(d) refuse to recognize the stupidity of the argument and nuke the hell out of each other until one emerges victorious (whether he/she still has their sense of sight at that point is moot).
Either way, there isn't a problem if all parties (and their respective supporters/followers, plus innocent bystanders) agree to the same solution and abide by the result. But that doesn't happen when one side has the arrogance to ignore what they're told and the other the desperation to do whatever they're told, now, does it...