And like i said, there would certainly be those who would try/do and stop 'em.
And the likelyhood of the VN reaching us before any of the fleets warning us or trying to join forces with us, as we are at the very hiney end of the galaxy, is unlikely.
And in any case, even if they had the supoerpower to destroy anyone, the other who could stop them would be more important then us.
We are at the very bottom of the universal feeding pool.