Withdrawal
Difficult, replicated real-life
Disobedience possible; 35%
Protection from harm
Argued distress was more 'momentary excitement' than harm (cost-benefit analysis)
Maintained people would not have cared for ethical issues had there been lower obedience levels
Obedient participants told behaviour normal
Disobedient participants told behaviour was desirable
Questionnaire:
92% responded
84% glad to have done it
2% regretted
74% learned personal importance
Independent psychiatrist assessed psychological damage a year post-experiment (found nothing)