I see what you have done there.You must find that frustrating, and presumably (hopefully) realise that I also am frustrated by the fact that I have been unable to understand the logic/justification underlying what I understand to be your view. I'm therefore going to have yet another go to 'ask the question', by initially splitting it into two parts, each of which can (and should be) answered with Yes/No....
(1)... My understanding is that you regard it as 'wrong'/'unfortunate'/'annoying'/whatever that the failure to correct deviations ('errors'/'incorrect') in use of English from what you were taught has led to perpetuation/spread of those 'errors' such that they have now become part of 'common English usage' (even though you still regard them as 'incorrect'). Is that true (Yes/No)?(2)... Do you similarly believe that it would have been reasonable for, say, your grandfather to regard it as 'wrong'/'unfortunate'/'annoying'/whatever that the failure to correct deviations ('errors'/'incorrect') in use of English from what he was taught had led to perpetuation/spread of those 'errors' such that they became part of 'common English usage' (even though he still regard them as 'incorrect') (Yes/No)?
Unless I have totally misunderstood you for years, I imagine that your answer to (1) will be 'Yes'.
If your answer to (2) is also yes, then how do you justify your personal view? If your grandfather regarded the language that he was taught as being the only 'correct' English, which would remain the only correct English for evermore, then why did the 'changed' language (which he still regarded as incorrect) suddenly become 'correct' when you were born and started learning the language?
In terms of a language which (I think) has been around, and constantly 'evolving', for something like 1,500 years, it would seem inappropriate (and, frankly, 'arrogant') to decide that the point in time at which you happened to have been born (and started learning the language) was so 'special' that the evolved state of English at that point in time suddenly became, and was going to remain for evermore, the only 'correct English'.
On the other hand, if your answer to (2) is 'No', then why does your view of what is the only 'correct' English (for evermore) 'trump' your grandfather's view that the language he had been taught would be the only correct English (for evermore), such that he would regard the English you had been taught to be 'incorrect;' ?
You want yes/no answers but include so many qualifiers which require explanation it makes yes/no impossible.
I will just say that I have said many times we cannot alter what has already happened but there is no need to continue having the language decided by the ignorant majority aided by you for some reason.
That you (say you) don't understand why all mistakes should be corrected (just those you think should be) is very strange.
