I was not trying to imply that all pax are idiots. I think it's quite the opposite. However, there will always be the few bad apples who insist on ignoring the sign,and for such people, I have little pity if something bad happens.
The comment about the ding wasn't meant to be sarcastic, but I honestly wonder if they think it would be on if the pilots didn't think it necessary. Why on earth will the seatbelt sign be on?