Your statement is not valid as you didn't know the whole story. Try to read the source of the issue so you will be enlightened. Donaire is the one who challenges and sets the fight with Casimero so there's no reason for canceling unless it was a personal and big private matter.
Look at how Casimero is silent on the issue because their camp will be in a bad image as they know the mistake they did. The promoters and organizers can't even do anything to fix the problem. Boxing champ Inoue even sides with Nonito as he understands the situation.
We never know the whole story because what we have is just a statement that is released in the media or to their personal youtube channel, also we don't know who is saying the truth so we are just left guessing, and based on what I read, I think the public sides on Casimero because they understand trash talk is normal and they just want to see this fight.
It was a he said, she said sort of scenario, one camp is accusing the other, while the other camp is denying the issue. Again, we should move on guys, no need to dig deeper.
Donaire and Casimero has move on their separate ways, but if they remain champions, the fight between the two is unavoidable in the future.