In that case, there’s no need to present an argument that the need to enforce morality overrides the constitution.
Well here’s what I meant by that: If the states should be the ones to impose bans, they aren’t doing their job. Mass and Iowa for example come to mind first. So if they won’t, the federal gov’t should intervene in an ‘emergency’ situation (that is, one where basic things like life and marriage are ubder attack) and ban it on a national level. However I suppose that whole argument is moot because of Tailgunner’s post that I mentioned—the states have a role in the amendment process.