No need for rudeness.
1. The halachah does not treat dina d’malchusa the same as our own halachah. It certainly doesn’t treat it any more literally than the government itself does.
2. Yes. I’m not sure what point you are trying to bring out; an issur based on a safek is still an issur.
The point I am trying to bring out is that halachah treats all technical issurim as issurim, but the government does not treat all technical violations as violations. They got Rubashkin (from what I’m told) on what is fairly normal business practice (the bank was not deceived in any way) because they wanted to get him.