Exactly-- and while I trust an airline pilot to be able to fly me to my destination on a commercial flight, and an anesthesiologist to be able to wake me right up at the end of a routine colonoscopy... I definitely don't trust my neighbor who is neither a pilot nor a physician to do either of those things.
Even if he were REALLY persuasive.
Nahhhhh-- but it's just like a big lawnmower that flies, right? How hard can it be? I've watched a lot of movies about flying airplanes, and I know all about it... 
There's a certain specialist skill set involved, if that makes sense. And while it might SEEM as though it should be easy to fly a 747, or monitor vitals with one hand on a digital regulator... and while sure, there are
protocols to follow for both activities, it's just a LOT to ask someone to get right on the very first attempt.
What is sad is that some people
really can't understand that. I mean,
I understand that my kitchen would be a
nightmare for a person with a different food allergy-- we do a LOT of cooking from scratch, and some things are really
everywhere in my kitchen. So I would make that crystal clear to another person (in fact, I do-- to friends with celiac, for example)-- I'm not pushing my food on them, but I'm open about what goes into what I've made (what goes in on purpose, anyway). No way could I make something truly free of all wheat contamination at this point. The difference is that I'm experienced enough
to know better. Most people are not.
In fact, the pushier people are, the
less I trust them. DD had that one figured out when she was only five or six years old, in fact.
