 QBists identify probability 1 with an individual agent’s subjective certainty, in contrast to the objective certainty EPR took to entail the existence of a physical quantity whose value could be predicted with probability 1. Stairs (2011) referred to developments of David Lewis’s (1986: Appendix C) best systems analysis as providing an alternative notion of objective probability in which this entailment fails (see entry on  interpretations of probability,  §3.6). So QBist subjectivism about probability is not necessary to block the EPR inference to an element of reality (or beable, to use Bell’s term) grounding the objective certainty of Bob’s distant measurement outcome on his component of a non-separable system following Alice’s measurement on her component, thereby undercutting Bell’s proof that quantum theory is not locally causal.