In some cases, it's because it's what we know how to do. Performance problems become training problems because we know how to solve training problems. In other cases we don't know how to say no to training requests. None of this is rocket science. We're in the business of training.
Training is so important that they have to support it.
Implementation of the latest fad will show how good we are. If training is well designed it will make a difference. Training will solve most performance problems. It takes guts and a willingness to change. It's our turn to change, too.