I think it's important to specify that God never helps anybody sin, or forces them to sin, or makes them sin more. I don't feel comfortable with the term "double predestination" because it seems to imply this (i.e. the Lord works in their life to send that person to hell the same way he does with the elect to send them to heaven.)

Biblically, the Lord ordains (and "predestines," depending on how you use the word) everything, but in the case of the unregenerate, to be predestined to hell just means they'll be "left alone," so to speak.

(Latin phrase goes here.)