That may be the point of your essay but, if so, it is not well made.
I don't care for the term 'language policing' any more than the, (often derogatory), use of 'purist'. However, there is a significant need to observe & comment on words poorly or inappropriately used.
There are, of course, those that excuse even the worst abuses of the language on the grounds that language is not static. That is a poor excuse for laziness, arrogance, or obstinacy.
Languages need protection but that neither means that they mustn't change nor that those who use them poorly for genuine reasons, such as early learners, non-native speakers or those with learning difficulties or lack of adequate schooling, should be castigated for their errors. I fully agree that in those circumstances latitude and gentle coaching is an appropriate response.
However, the reality is that many today who have ample access to tools, education, etc., including even many whose very occupation is dependent on the use of language, appear to have little awareness of even basic vocabulary, grammar, tone or effectiveness.