Double predestination is simply the logical conclusion of single predestination, which is patently scriptural. In reality, if you don't believe in double, then you don't believe in single. To reduce God to a stenographer simply writing down the names of those who will accept Him makes a mockery of the concept of predestination. Either God determines what He wants in His sovereignty, or He is a follower of men.
God doesn't need to create anything that is good for nothingness. Instead, He created some creatures with volition. Creatures with volition have volitional responsibility. When we choose to rebel from Him, we are accountable for that rebellion.
Yes, men are always accountable for their rebellion. However, God creates no one for nothingness. All the lost whom God creates are needed to further God's plan. Look at Judas. It's just a fact that God creates most, knowing full well that they will not enter Heaven. If they served no purpose, then presumably God wouldn't bother to create them.
In God's magnificent grace and love, He brilliantly chose to condemn all of mankind before we are saved. Now by believing in Him through faith in Christ, we have salvation from condemnation. This is discernibly distinct while exercising the mind of Christ, from supporting the doctrine of double predestination or thinking God has predestined particular human to the Lake of Fire.
I agree with the first two sentences, and they are perfectly consistent with double predestination. How are they discernibly distinct? The faith in Christ that leads to salvation comes solely from God. God predestines to whom He will give this faith. The alternative is that man generates his own faith, and I doubt you believe that. :)
The Lake of Fire was created with respect to the fallen angels and Satan, but is is also a place for things which are PONEROS(evil which is good for nothingness).
Lost people are good for nothingness after they physically die. However, when on earth, God uses them for His purposes.
Predestination is Scriptural, although double predestination was an invention of Beza's mind out of fellowship with Him.