everything that is created can be destroyed.
im not actually talking about 1 being destroying another, i said that anything can be destroyed if it has been made. You may be right that an incorporeal being cant be destroyed by a human, but u can bet your ass that there is something that may not be human that could destroy it, or it could even destroy itself it it chose to. the point is, it still CAN be destroyed...
I think you mean to say anything can be undone. I wouldn't say that "destroyed" is the right word.