Does quantum mechanics violate the Bell inequalities?

It is argued that any quantum probability should correspond to a ratio between the number of counts (positive results) in some measurement and the number of copies of the physical system initially prepared. Then, the proofs of Bell's theorem are criticized on the grounds that the probabilities used to show a violation of the Bell inequalities do not fulfill that condition. A hidden-variables model is proposed which reproduces the results of the optical experimental tests of the inequalities, even with perfect polarizers and detectors.