Bell's theorem is proved to rest on a metatheoretical assumption (MCP) regarding the validity of physical laws that is compatible with the worldview of Classical Physics, not with the worldview of Quantum Physics (QP). A new general principle (MGP) is stated here that is consistent with the basic operational philosophy of QP. By using MGP, which does not modify the observative content of QP, some sample proofs of Bell's theorem are invalidated. We conclude that the adoption of a more rigorous quantum attitude leads to give up with some features, as nonlocality and noncompatibility with any form of realism, that are usually retained to be unavoidable (and somewhat paradoxical) consequences of QP.