There are plenty of times that one has a duty to violate the law. Consider that the US Supreme Court does not render advisory opinions; to overturn an unconstitutional law, one must violate it first, then defend oneself all the way to the Supremes.

This is a very risky proposition as it happens all the time that the Supreme Court will deny certiori over some petty issue.

If you wonder why I use my real name here and elsewhere online, it's because I regard it as my duty to - someday - defend myself before the Supreme Court.