Originally Posted by The Navigator
Remember he injected Destro with nanomites at the end of GI Joe 1 and told him to "call me commander" right before the Joes arrested them. So leaving him behind at the prison was just a case of "you have outlived your usefulness" while he went off to resume control of his infrastructure.
Sorry, I still don't get it.
"Now I am your commander. I change your face. I call you Destro. You are now under my control and will follow my orders.... oh no, wait, we get arrested... oh no, we are put in a tank... oh good, we are finally freed! I know, Destro, I just said that you are now my new servant, but I just decided that you are of no use for me, I leave you here."