Compatibilists often argue that determinism and free will (and moral responsibility) are compatible since their view is that what constitutes freedom is not affected by whether or not determinism holds. Hence, in this case, the debate is not about the consequences of determinism, but rather what freedom is.

In my mind, that the known laws of nature do not permit "free will" in the way incompatibilists define it is trivial. (regardless of whether the universe is truly deterministic or also has some randomness sprinkled on top)