1) Rejects utilitarian justifications for harming individuals with moral rights.
Regan agrees with the standard criticisms of utilitarian views.
Regan agrees that it makes more sense to conceive of happiness in terms of preference- or desire-satisfaction rather than hedonistically.
This is a version of the argument from marginal cases which was described earlier: he argues that there is no basis for attributing rights to marginal humans which would not also apply to many animals.
Regan claims that his rights view is the real philosophical basis for the abolitionist claims of many animal rights advocates, because although utilitarians could endorse various harmful practices under at least certain circumstances, if animals have moral rights, then you could not justify those harms in purely utilitarian terms.
Notice that on Regan's view there is basically one moral right, the right not to be harmed on purely utilitarian grounds. To "have moral rights" for Regan is to have this one basic right.
Where it is impossible to avoid harming individuals, Regan endorses two principles for deciding whose rights to override:
For illustrations of these principles' application, click here.
Obviously Regan owes us an analysis of what harm amounts to. He defines harm in terms
of diminution in the capacity to form and satisfy desires.
Regan on harm
Regan's analysis of harm, coupled with his worse-off principle, might imply
that some medical research is justifiable, even on his strict animal rights position.
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[Application to medical research]