That guy is a slap in the face to every engineer who had to work for their credentials instead of "name it and claim it" in the name of "free speech".
This is like shouting "fire in a theater" - it causes harm. Claiming to be an engineer, and driving public opinion based on that false credibility, is dangerous. Setting a precedent for it absolutely and without a single doubt has already cost many people their lives (look at Mexico deaths from earthquakes) and absolutely and without a doubt stages for more people to lose life and substantial property.
If one falsely claims to be a police officer, and extorts a fine, it is a crime. I see this as being on the same order of harm to the society.