There is an element of Chance with the framework of Design.
Non sequitur. The universe as a whole ** is **designed even though some events are not intended. No one believes cars are not designed because they kill people! That is the price we pay for living in a physical world. An accident-free planet is a fantasy.
The element of free will also leads to unintended consequences.
Then the designer is not omniscient, because for an omniscient designer all consequences are intended.
Another non sequitur. Car manufacturers **know **some of their cars will have accidents yet their cars are still designed.
It seems to me that you are getting into some deep theological waters here. If God is creator/designer of all, then there can be no undesigned elements in creation. If you assert the presence of undesigned elements, then those undesigned elements were not created/designed by God.
Your argument implies that an Omnipotent Creator
cannot create a universe with an element of chance within the framework of Design! Please explain why it is impossible when computer programmers do precisely that. Do they have more power than God? In their case it is gratuitous, of course, but the universe is immensely more complex than anything they design. The onus is on you to describe a feasible universe in which there are no unfortunate coincidences…