President Bush said that it is a "cruel" thing that the captors of the hostages do with hints of releases that often do not materialize. Is it any less cruel to request holding back the release of hostages for one's own political gain? The "October Surprise" investigation must continue.B. & E. Nilenders, Huntingdon Valley, Pa. Letters are welcome. Only a selection can be published, subject to condensation, and none acknowledged. Please address them to "Readers Write," One Norway St., Boston, MA 02115.