You should tell your father about the Vong.
Apparently 20 years before A New Hope, "Senator" Palpatine noticed these planet sized generational colony ships crossing the galactic void and decided to save the Galaxy from being sacked, because deep down, he's a nice guy with everyone's best interests at heart.
The new republic is facing down against these world ships in the new novels and they're really regretting having destroyed all those Deathstars. Really, really, really regretting it.
Your Dad was right.