I do disaster planning for counties,hospitals,big companies,etc.
I had a presentation for a hospital and basically showed them very very detailed how they need to prepare for flash flooding. And I was absolutely shot down and basically booed out of the room.
"We never can get flash flooding here, it is impossible, you have no idea what you are talking about!"
Exactly two weeks later you could see them on national news, they had 120cm(around 4 feet) on their ground floor, including their ED.
Even if they had signed us it wouldn't have changed a thing (our recommendations take years to show effects) and people died (it is actually part of one of the worst flash flooding disasters in history,over 220 people died). So I can't be happy about it at all.
But my team and I were very very very much proven right. (And meanwhile even multiple court ordered experts have agreed on our assessment)