If I steal, it is a crime. If I convince my library board to pay me far beyond my actual worth it's not a crime -- it would be quite legal, in fact -- even though it may be unethical and even immoral. Personally I would consider it a form of theft but there are others who wouldn't care.

If I build a building to the specs supplied by a bad engineer or architect even though I know that those specs are woefully wrong, am I guilty of a crime when the building collapses and kills people?

Not every wrong IS a crime. But every wrong should have an affordable way to right it as best the justice system can right something.