Another one would be pairing opposite views: white nationalism and black liberation theology, extreme radical feminism and conservative Catholic theology, etc. Then people with weak preexisting convictions are unlikely to be swayed to one side.

The thing is, in both those cases the two positions have more in common than either would be willing to admit.

For example, both white nationalism and black liberation theology state that people of different races shouldn't live together. Both extreme radical feminism and conservative Catholic theology have similar positions on pornography for reasons that are actually remarkably similar once one unpacks their jargon.