Yes, I suppose prescriptivism is something of a cross to bear – “glass houses” and all that – but I think it does have its place in trying to correct the obvious misusage of a word through unfortunate ignorance, and keep that misusage out the authoritative representatives of the words of our language, i.e. dictionaries.

If everyone were to apply the “judge not” argument to language, reductio ad absurdum, there would be no language. There would be no agreement on the meaning, form, or spelling of words, and no agreement on rules or conventions. People would utter whatever they chose, and no one would understand them.

On the other hand, having written all of the above, I do not advocate prescriptivism being taken to the point of restricting creativity, or bringing our language to a stagnant halt.