It's basically a get out of jail free card for God: Yes we have free will so if we end up in Hell it's our fault and not God's, even though He decided before the beginning of time who the Elect would be and who wouldn't.
“However, when they act according to their own debased free will then they are headed for Hell”. Not quite true. calvinists believe that God makes us do all things. Because he hasn’t chosen us, then it is because of him, that we do all the bad things. My question to all calvinists is always the same-If God has already chosen us (and none of us know if we are chosen or not), then and it doesn’t matter what we choose to believe, so what is the point of Christ’s death and resurrection? Crickets...