Whether character exists

That traits are consistent across a wide range of situations, stable over time, and integrated with one another

That every culture recognises the same virtues

That traits are innate rather than learned

That everyone has the same traits to different degrees

How much of a hurry the student had been put in, not the topic of the talk

Whether the student had read the parable of the Good Samaritan

The student's score on a religiosity measure

The time of day

The evidence tells against broad global traits but is compatible with numerous narrow local ones

Character traits do not exist at all

Situations have no effect on behaviour

Virtue ethics is confirmed by the experiments

Aristotle held that full virtue is rare and hard-won, so experiments on unselected subjects test a population the theory expects to fail

Experiments are too rare to establish anything

Only a few situations are genuinely powerful

Virtue is innate in a small minority

The guards were briefed on the behaviour expected of them, and the study had its conclusion before it had data

The results were much stronger than reported

The subjects were paid too little

The experiment was never actually run

Dispositions are real and predict aggregated conduct well

Character is formed by habituation

Moral failure is often a failure of perception

Good character reliably protects a person against a strong situation