The difference in rationale for opposition to gay marraige by nazis and conservatives is irellevant to the conclusion that both are opposed to it
the fact that both are opposed to it does not, by itself support your conclusion that, "The nazi racists share some of the benign views of conservatives."
To share the same views, they have to have the same (or similar) rationales. Otherwise it is simply coincidence that they have the same policy position. Ignoring the reasons for something is a very effective method of misleading and of self-deception.
The fact that the rationale is not the same blows your argument to hell. The fact that you are intentionally trying to ignore it shows you are not approaching this objectively.
Also, simply focusing only on holding a position in general is very misleading. Both conservatives and liberals want generally similar ends; reduce the deficit, help the poor, reduce evil in society, protect our national interests, etc. It you looked at it like that, you would have to reach the conclusion that the viewpoints are similar. However, differences in how those goals are prioritized and the different approaches dictated by the different understandings of social causation mean that the viewpoints are inextricably opposed.
If you are simply trying to be provocative, you are succeeding. If you are actually trying to encourage productive dialog, you are failing miserably.