Historically, the euthanasia debate has tended to focus on a number of key concerns. According to euthanasia opponent Ezekiel Emanuel, proponents of euthanasia have presented four main arguments: a) that people have a right to self-determination, and thus should be allowed to choose their own fate; b) assisting a subject to die might be a better choice than requiring that they continue to suffer; c) the distinction between passive euthanasia, which is often permitted, and active euthanasia, which is not substantive (or that the underlying principle–the doctrine of double effect–is unreasonable or unsound); and d) permitting euthanasia will not necessarily lead to unacceptable consequences. Pro-euthanasia activists often point to countries like the Netherlands and Belgium, and states like Oregon, where euthanasia has been legalized, to argue that it is mostly unproblematic.