If he had merely submitted the "critique and calculations" for "consideration" as a concerned citizen, he would have not gotten a fine. Simply put, he called himself an engineer and suggested that public infrastructure be changed. In Oregon, when you're not licensed by the state, you can't use the title "Engineer", and you definitely don't want to use it while trying to suggest modifications to public infrastructure.
I'm not equating the two in terms of "I believe both situations are completely just"... but doing what he did is akin to a thief walking himself into the police station. The purpose of the Board of Engineers in most states is not to decide what is "good engineering practice" and what is "bad engineering practice", it's to regulate licensure and set the bar for who is qualified to be an "Engineer" in the eyes of the state. He mis-navigated the American system, for better or worse, and paid a fine that is meant to dissuade people from doing things like this:
http://laist.com/2016/01/30/fake_civil_engineers_may_have_bu...