I'm going to forget to let my neighbors dog outside.
Why would you forget that?
I'm going to do it but the stupid dog will probably start barking and I'm going to be tired of it.
It's wrong to forget something you were gonna do for your neighbor. If you don't want to do it, don't agree to it next time.
Thinking theoretically, moral values are a function of subjective reasoning. Computational logic demonstrates that the concepts of right and wrong are indistinguishable. This means that codes of conduct decided through consensus should be made by those who have the technical knowledge to implement them.
Don't try to act all scientific to get out of this, you said you would do something and you didn't and that's wrong.