Philosopher Peter Singer of Princeton University has argued that ALF direct action can only be regarded as a just cause if it is non-violent, and that the ALF is at its most effective when uncovering evidence of animal abuse that other tactics could not expose.
” 普林斯顿大学生物伦理学教授彼得·辛格（Peter Singer）主张，ALF的直接行动只有在非暴力时才能被认作是一项正义的事业，而且当ALF曝光其他手段可能无法揭露的虐待动物的证据时，是最有战斗力的时候。