Quantum mechanical probabilities question for empiricists (or anyone)?

Question

Why is it difficult for empiricists to accept quantum mechanical probabilities as fundamentally unexplainable facts about the world?

Answer 1

Physicist are empiricists almost by definition and are unwilling to say any physical phenomena is unexplainable. They would think of it as "not yet explained". This is why they expanded our knowledge in the past, and will continue to do so in the future.

Answer 2

Because empiricists depend on experience -since quantum mechanical probabilities do not refer to "human scales" (as newtonian physics laws do), they are not accepted easily.
http://en.wikipedia.org/wiki/Empiricism