Well put. The problem is that on almost every issue, people think their own personal view is "above" the issue somehow (see dopamean's comment at the top of this page for an example). Atheists claim they shouldn't even have to debate religious people because it's so "obvious". Pro-choice people claim they shouldn't even have to debate pro-life people because women's rights are "so obvious". Same thing with gay marriage.

This is simply a horrible and almost completely ineffective way to argue your point. You can't pull the "so obvious" cop-out on any issue that has a clearly decisive split within a country.