Word usage policy

In a somewhat lighthearted newspaper column (dead link - the article had been removed) dealing with roads, traffic and commuting issues in a question and answer format a reader asks ...to coin a name for extreme speeders? Road rockets or road missiles doesn't quite do it -- not sufficiently prerogative. [Googling for "not sufficiently prerogative" in quotes may help.]

Isn't a newspaper usually allowed to correct readers' letters it publishes for spelling, grammar, and word usage? I cannot believe that neither the columnist nor the editor doesn't know the difference between "prerogative" and "pejorative".