The path that seems to have worked best for me is to start with the argument that you can't have a democracy if the incumbent can spy on the opposing candidates

The path that seems to have worked best for me is to start with the argument that you can't have a democracy if the incumbent can spy on the opposing candidates to help dig dirt and that this data can and will be used for non-terrorist uses. The typical response is that they trust that they wont use it for non terrorist uses, to which I reply with the sharing of data between NSA and the DEA to arrest people as well as now the Miranda case.