This is a difficult question. By analogy, should rich cannibals or human child abusers be legally permitted to indulge their pleasures if they offset the harm they cause with sufficiently large charitable donations to orphanages or children's charities elsewhere? On (indirect) utilitarian grounds if nothing else, we would all(?) favour an absolute legal prohibition on cannibalism and human child abuse. This analogy breaks down if the neuroscientfic evidence suggesting that pigs, for example, are at least as sentient as prelinguistic human toddlers turns out to be mistaken. I'm deeply pessimistic this is the case.