This is a good question. I would ask you, however, to think objectively about your objection. Be open minded to other opinions. Consider that you may very well be wrong, despite your emotions at the moment which seem to be accusing God of injustice.
God indeed created man, as well as Lucifer and all the evil angels, knowing they would all sin. Further, he created them all knowing that, should he create them, certain ones would suffer reprobation and eternal punishment.*
But that does not mean God caused them to sin. As St. Thomas says, God neither wills evil to be done, nor wills it not to be done, but permits it to be done. Why? To bring about a greater good. God is not bound to hold a defective will in a state of innocent existence. He may certainly do so, if he pleases, but he is not bound to.
Again, I don’t see how it follows that, simply because man “went bad” (just like your car analogy), that God therefore “made” him bad. He certainly permitted him to become bad, but to permit is not to make. It also seems to me – as well as St. Thomas – that God could not logically make a being naturally impeccable (see
dhspriory.org/thomas/QDdeVer24.htm). He may indeed hold it in an impeccable state supernaturally, as in the case of Mary, but he cannot make it impeccable by its own nature. So to ask why God did not create mankind naturally unable to do evil is to ask why God did not create an intrinsic impossibility, like asking why he did not create a round square, or two right hands, etc. Perhaps you could be more specific concerning where you feel God to blame?*
These are good questions though. I only hope you keep searching for the truth in an objective manner.