Issues can be moral, legal, neither, and both. Presuming an issue is strictly legal can preemptively invalidate efforts to address moral aspects of the issue.
If the moral aspect of an issue has universal consensus, there is little to discuss. This criteria shuts down meaningful discussion of ethics.
Edit: Laws follow from values, especially in democracies. As values change, eventually laws change, including the constitution. The gp was raising ethical considerations for us to consider. To me it seems like you discount and trivialize these concerns.