To be honest, I think your 100% right. It's still the responsibility of the crew to maximize the safety during the flight. I can imagine that, if I were a pilot, that I wouldn't allow some stranger to visit the cockpit during flight, even if he claims to be an aviation enthousiast.
However, I'm not a pilot, and I' mvery glad that, on my birthday, both SN crews gave me the opportunity. However, they took a great risk, by allowing me to visit the cockpit, but I wrote a letter, and I explained everything to them.
also, I met a SN pilot on this forum, and he tried to get on of these flights. Unfortunately, he didn't get one of them. I also wrote this in my letter, just to let the crew see that I'm no weirdo. However, even a weirdo could have written the very same things as I did.
So, to be honest: I thank the crews for letting me visit the flightdeck. Nevertheless, I know they took some serious risk, and if I were a pilot, I wouldn't allow it (except if the passenger can convince me that he's interested in aviation).
Ivan Coninx - Brussels Aviation Photography