Stopping Adam and Eve would have stripped them of their free will.
Per @AllenWitmerMiller’s description of Molinism God sees all of their choices and the choices of all humanity from the beginning to the end of all time.
God knew that humanity would fall, but created us and loved us in spite of our failings. God created us with the solution to those failings in mind: His self sacrifice on the Cross, and He showed us the possibility for our future with His Resurrection