I am going to give an answer which must be accepted by reason alone, rather than task myself with attempting to deduce the doctrine from Scripture. Some considerations:
1. God is Supremely Good.
2. God is timeless and eternal (against the Open Theists).
3. God has a perfect knowledge of all possible and actual realities.
The Calvinists make a clear error in their doctrine of double pre-destination, namely, that God destines the elect for Heaven and the reprobate for Hell. That He makes them specifically for this reason. To quote
wikipedia, he "willed" them to go to Hell.
This contradicts the first point: God is Supremely Good. A God who is the very Analogon of Goodness of Itself cannot possibly make anyone worse. He cannot directly will or approve an evil. But it is a very great evil for a soul to be cast into Hell.
Let the Calvinists claim as much as they like that they've found this terrible doctrine in St. Augustine, but I have yet to find it. In fact, he says the exact opposite in precisely this context in "To Simplician - On Diverse Questions, question 2, section 8." I quote: "That God made one he was to love is unquestionably true. But it is absurd to say that he made some one he was going to hate. For another Scripture says, 'Thou abhorrest none of the things which thou didst make; for never wouldest thou have formed anything if thou didst hate it' (Wisdom 11:24)."
On the other hand, and St. Augustine also raises this point in the same place, every good thing, insofar as it is good, comes from God. Even our good acts of the will. So it is undoubtedly true that God predestines the elect. But it is undoubtedly false that he predestines the reprobate: this would require God to will that someone go to Hell, and this is false.
Of course, God
foreknows who will go to Heaven and who will go to Hell. But he permits the damnation of the reprobate. He does not will it. The Church has condemned that terrible doctrine:
"God predestines
no one to go to hell" (CCC 1037).
He does not will the reprobation of the reprobate. On the contrary, we should believe that it was precisely for these poor souls for whom He wept so bitterly in the garden.