So how do you define a “defining issue”?
Defining issues are wrongs actually brought into being by government introduced legislation as opposed to matters occurring or happening in our world. With respect to things that are happening we may argue about contributory negligence and about what might be required in legislation to rectify that and also to prevent it. But what we cannot argue about is when governments actually legislate to permit wrong. What we cannot argue about is when governments legislate to permit evil. And especially what we cannot argue about is when governments legislate to compel evil.