>The question I hear is "why shouldn't we be pulling over stolen cars?". It's a much harder one to answer than the straw man questions we set up for these things.

The "why shouldn't we be pulling over stolen cars?" question is just a more specific variant of GP's "nothing to hide" question. i.e., the only people asking it are those who aren't stealing cars, thus have "nothing to hide".

The answer is the same.