Buddhist ethics are not a legalistic system that allows us to justify behavior on the basis of loopholes, technicalities, or a strict construction of the text. Buddhist ethics are based on motivation and intent. An ethical act is one that is driven by love and compassion and guided by the desire to do the least harm possible to any living being in whatever circumstance we find ourselves. An unethical act is one that is driven by craving, fear, or anger and guided by the desire to benefit ourselves by harming another living being. Thinking like a lawyer or an academic logician and claiming that it is acceptable to harm another sentient being for our own selfish benefit based on hair-splitting distinctions and nimble logic is contrary to the teaching of the Buddha.
From: The Great Compassion: Buddhism and Animal Rights (Norm Phelps)