In the anime world...the adults can do nothink! The children shall lead the way!
joke.
It is pretty clear that the Vajra are a go-between for the big bad. Whether or not that is Galaxy or something else, we will find out. The Zentraedi were overpowered at the beginning of Macross as well. Well, ok, they were more numerous and numbers do count for a lot in battle. The show isn't bad. It isn't Hemingway or anything. Just enjoy it for what it is.