Fans should always be allowed to boo. It's in every sport. There is no cheer if there is no boo. If you want a sport without boo, be prepared to have a sport without any cheering. Fans love to cheer and boo...
I greatly appreciate the booing and the IAAF should celebrate it instead of trying to cover it up.
You can make a story around that.
The "cover up" story is not a good one however.
Again, they are missing the boat.