The Argument of Freewill, or can imperfection come from perfection?

While here on the internet and out and about hearing preachers, I've come into a very interesting argument as to why humans "deserve eternal torment". The argument that God loves so so much that he didn't want us to be mindless robots so he gave us freewill, the ability to do and think as we see fit. But because of our (preexisting) sinful nature, we rebeled and so deserve to burn for eternity. And that the perfect world became imperfect. Now there is a flaw in this as those who make this argument often claim that God is all knowing, all powerful and omnibenevolent. The flaws in this argument suggest that God did not predict how humans would behaive. So how could he be all knowing if he didn't know that Adam and Eve would take a bite out of something they shouldn't. And if God is so damn perfect, how could flawed creations be made by him. Another issue I have is a moral issue. God is said not to want humans to be like robots, yet if I understand what many of his followers say about having faith and forsaking evidence for things like Evolution or Abiogenesis or the age of the universe, then it seems to me God wants unthinking automatons. Could he given us freewill so he would have an excuse to send people to hell?