Final answer:
Hard determinists and libertarians agree that freewill and determinism are incompatible, both subscribing to the incompatibilist perspective, but they do so for contrasting reasons.
Step-by-step explanation:
True, hard determinists and libertarians both agree that freewill is incompatible with determinism. This shared viewpoint stems from their commitment to incompatibilism. Incompatibilists, which include both hard determinists and libertarians, hold that determinism fundamentally conflicts with the notion of acting freely. Hard determinists assert that if determinism is true, then we lack freedom and moral responsibility. Conversely, libertarians maintain that because we have freedom and are morally responsible, determinism must therefore be false. Compatibilists, on the other hand, believe in soft determinism, proposing that free will can coexist with deterministic principles.