If one is familiar with Samuel Clemens, one might run across an interesting question in one of his tales, which goes something like, Well, Huck, if they be men, why don't they talk like men?
One of most important foundations of Grammar, is that Grammar is based on social conventions paralleled to a common perceptible environment, yet when you get your books on Grammar, be it any member of our Grammar Matrix, Common Grammar, Arithmetic, Algebra and Geometry, one is lucky if the author of such works even mentions it, or presents their material in regard to keeping those two conventions. Thus people actually end up spouting mythology and down right nonsense about our grammar systems. It is the disregard for these conventions which promote human discord, with one's self and with one's environment.
How is it, when Grammar is not possible without these conventions, that instead of promoting human unity through the unity of judgment, do we, like savage fools, run from one war to another with each other? Because, in the end, it not possible that survival of the most fit will not mean, survival of the most intelligent, the most literate, thus evolution, itself is what we witness in human discord, eradication of the stupid, without regard to race, gender, doctrine, etc. We live and die, one might say, according to the principles of evolutionary development aimed at producing a living life support, global system.