There is a whole little section that you are missing in this. Quantum, being probability, is always only probability. Probability can be very precise, depending on how much probability a scientist wants to put into it. The interesting thing about probability is, you can prove anything with quantum.

Let's say that you set out to use quantum to prove that evolution is true. You could do it. At the same time, let's say that the scientist in the next room set out to prove that evolution could never happen because of cause and effect. He could do it as well.

Quantum can prove anything, even very precisely. Quantum can even be used to prove the likelihood of evolution to be higher or lower, depending on the way the scientists uses quantum. At the same time, the scientist next door can use quantum to prove various levels of evolution improbability.

Essentially, quantum gives a scientist direction for testing his ideas and theories, and the encouragement to not give up until he has proven that his ideas are true or false... proven through other methods than quantum/probability, since probability alone proves nothing.