Earlier quoted context omitted.
Indeed, I understand that fully. My point is that the English language is not prescriptive in practice. In fact, even if you're a prescriptivist, you could easily argue that "its" is a special case, since most English possessives are formed with apostrophe s.
Please stop making excuses for illiteracy. It's nonsense like this that contributes to the decline of educational standards.
If its versus it's implied someone is illiterate, we'd all be completely uneducated because we didn't write in Middle English.