Dina Demalchusa Dina applies only in a country where the laws are neither arbitrary nor cruel, like they were in post-reconquista Spain, and that it does not apply to yaharog veal yaavor mitzvos, like bowing to a cross.
You also posted an encouragement to lie to a judge in a country where the government is neither cruel nor arbitrary. If you did so b’meizid, it is a clear aveirah, a violation of dina demalchusa dina, among other issurim.