I thought about this a bit more.
One of the most brilliant people I know (Yale undergrad, Harvard med, cardiologist, important job at FDA) actually said "risk-adverse" a few weeks ago. I corrected him with a mock-serious tone but I don't think any less of him. I have no problem entrusting him to make decisions (about which drugs get approved or not) that affect the health and safety of many people.
Another brilliant guy (Harvard undergrad, Harvard law, former prosecutor, now high-profile defense lawyer) said his father's "prostrate" cancer killed him. Again, I would be completely comfortable having this guy defend me in a court of law. Is his goof evidence of lazy thinking or stupidity? Not in my book.
Check out "A Man Called Ove" either the book or movie in theaters now. This is about an unhappy guy who is excessively hung up on rules, including usage/grammar. I really enjoyed the movie.