I've been learning recently where letters to the editor come from. A lot of people send them, but you know what? A lot of people have no point. And a lot of people also do not use English very well.
So I've come to the sudden realization that a person with a point and enough of a grasp of English to write three or four good sentences could get their letters pretty much anywhere. Particularly if they wrote their letters in a reasonably timely way, say before the next issue of the periodical came out. (Or even after, depending on deadlines.)
Ok, this might not work at the New Yorker. Those letter-writers are smart. But I bet you it works most other places.