God could want there to be wicked creatures for his own good purpose???
Which purpose? So that others might be saved. We can imagine the following scenario: Smith and Jones are members of the Crips, Jones dies is a drive-by shooting and Smith has a vision of Jones in hell. Smith repents of his sin, accepts Jesus as his Lord and Savior, becomes an inner-city minister who brings thousands of kids otherwise headed for a life of gang violence to Jesus.
Except for one one thing. Smith, and every one of those gang kids could have been saved by God's sovereign decree if he had chosen to give it. Jones' eternal damnation could have been avoided without any further loss of souls.
It is easier to make these "hidden good" arguments where the hidden good might become evident once if we knew what free choices other people might have made, or where we don't know the final outcome of everything. Hurricane Katrina, for all its horror, could end up resulting in more people going to heaven than would otherwise have gone to heaven. But for every soul which suffers eternal punishment. we know that that sould could have been saved, and that that person's being saved would not have resulted in any other person's being lost. The final result is known, to suggest that some other final result would not have been better would be to violate every moral intuition I have.
But shouldn't I nevertheless accept it because it is taught in God's word? God, by definition, is a being who is omnipotent, omniscient and perfectly good. A being who predestines people for everlasting punishment doesn't meet the third requirement, and therefore isn't God. So if the Bible teaches predestination and reprobation, it is not God's word, but only the Word of an omnipotent Fred.
Who are you O man, to answer back to Fred? Not such a show-stopper, is it?