Is presence at the scene of a crime but failure to prevent it sufficient to establish aiding and abetting?

presence at the scene of a crime nor knowledge of, but failure to prevent it, is sufficient to establish aiding and abetting its commission. [Citations.] However, '[a]mong the factors which may be considered in making the determination of aiding and abetting are: presence at the scene of the crime, companionship, and conduct before and after the offense.' " (People v. Campbell (1994) 25 Cal.App.4th 402, 409.) "Whether defendant aided and abetted the crime is a question of fact, and on appeal all conflicts in the evidence and reasonable inferences must be resolved in favor of the judgment." (People v. Mitchell (1986) 183 Cal.App.3d 325, 329.)