It's about children and don't forget that a psychiatrist is making the determination based on lots of evidence, the parent or other guardian, teacher, etc. isn't deciding this.

There's a randomness to ODD, doesn't just happen when someone is trying to get the child to do something oneous. Random anger and deliberately "annoying" others isn't going to be the result of adults. Not all childhood problems are the parents, adults, other person's fault :-) It's probably a function of something like ADD/ADHD or another unknown.