The Wise in Middle Earth

[Inziladun]

Originally Posted by The Mouth of Sauron

Let's be honest - it was insanity sending 4 hobbits off to Mordor in the first place. And incredible that Elrond, Gandalf and Aragorn would countenance such a move.

Not to nitpick (Heaven forbid! ), but really only one Hobbit was 'sent' to Mordor: Frodo. The rest, with the remainder of the Fellowship, were merely companions to aid him along the way, for as far as they would, or could continue.
The choice of who was to go was, I think, primarily Elrond's, though he gave in to Gandalf's wish to allow Merry and Pippin. Aragorn seems to have played no part in the selection, beyond volunteering himself. Gandalf obviously had, though maybe not conciously, a foresight that Merry and Pippin would play a crucial role, and Elrond was wise enough to trust him.