This study compares two Missouri capital cases where evidence of the defendants' personality disorder and childhood abuse history were predominant themes at trial, in order to assess the jurors' receptivity to mental mitigating evidence. The cases confirm theories suggested by Capital Jury Project scholars that jurors engage in arbitrary decision making and premature and automatic death-penalty decisions, that they speculate about parole, and that they are guided by the racial composition of the jury. This study goes one step further to suggest that these errors in decision making can skew death decisions by distracting holdout jurors from considering and giving effect to the mitigation evidence. Some jurors may be more inclined than others to be distracted by arbitrary factors because they focus more on the retributive aspects of the case or the severity of the injury than on defendant's culpability. Juror errors like premature and automatic death-penalty decision making and extralegal considerations about parole and race may drive the majority of jurors to persuade the holdouts to join in a death verdict. These errors may stifle moral considerations of mitigating evidence at deliberations, and they serve as a “counterweight” to the proper weighing of the evidence. The parts of a capital trial, therefore, are linked together and act as weights and counterweights against each other.