Get it correct

In today's discussion, and in subsequent ones, I'm going to dwell on some aspects of the English language that many people take for granted, creating the impression that those aspects are not important.

Indeed, in my line of work, I have heard people who should know better make statements such as:
This error is not fatal.
If a sentence ain't (sic) broken, don't fix it.

These and similar statements are meant to create a level of permissibility, so that those who do not want to write or speak good English could say: Anything goes!!!

But in English (and other languages, written or spoken), every error, no matter how little others may see it, is fatal, unfortunate, significant, regrettable.

With English, we are talking about a language whose written form is so delicate that the position of a mere comma in a sentence can change the meaning of that sentence, while the omission of a comma can render that sentence meaningless or ambiguous.