This is the unintended consequence of trying to do something that should be normal and natural. There's no reason why Bono shouldn't be able to go out and do things like this. I think that the producers of DWTS knew what the logistics were going to be like going in, and accepted this as part of the costs related to the publicity that would go towards promoting the show.
America does seem to have a growing number of crazies motivated by cultural issues. That's what sad about all of this.