As a former public defender who often got similar questions, I found it helpful to tell people that my job was law enforcement: making sure that no accused person was convicted unless police and prosecutors obeyed the law, dotted every I and crossed every T required to convict, that in doing so I was enforcing and defending the Constitution, and thus defending the person who was asking me the question, whether that person felt s/he needed defending or not. Said with a tiny bit of lawyer's arrogance (faux-rudeness), that usually turned rude questioning into authentic interest about what my job was really about, and gave me an opportunity to educate people about the many problems in the criminal justice system as it exists in our country.

I don't know what Harry Callahan would say about that.

Fine line between wit and rudeness. TM has wit; SC has rudeness.

Also, a bigger weiner.

Prig.