Pritti said:
The entire movie was to stop Broly from destroying the South Galaxy. In the film going by the original Japanese version without subs (the only version I've seen), they never said Broly destroyed the galaxy. They said he was rampaging throughout the galaxy and Kaiosama was worried that his galaxy was next.
The narration clearly stated The South Galaxy is under Super Saiyan attack. It did not say destroyed. It never said destroyed. Broly did not gradually destroy the galaxy either, the South Galaxy was still there, or at least parts of it. The entire goal of the film was preventing the total destruction of the South Galaxy.
http://www.kanzenshuu.com/forum/viewtopic.php?t=26373&start=20
Narrator, at the start: The Southern Galaxy has fallen under Super Saiyan attack
Kaio, at the start:
Then, the Southern Galaxy really is being…At this rate, even my Northern Galaxy will be destroyed!
Paragus, explaining stuff to Vegeta: He is wreaking havoc all over an area of the Southern Galaxy with his fearsome power. At his pace, even the New Planet Vegeta that we worked to establish will fall to the Legendary Super Saiyan…
Kaio explaining things to Goku: Goku: The Southern Galaxy attacked by a Super Saiyan?
Kaio: Mm. He's already finished tearing up the Southern Galaxy, and appears to be after my Northern Galaxy next.
Kaio, shortly after the above: First go check the Southern Galaxy.
(Goku proceeds to teleport to a planet full of ruined buildings.)
Goku, when Broli powers up a bit during their first little fight: You're the one who destroyed the Southern Galaxy, ain't you Broli?
Goku, repeating himself shortly after the above: He's the Super Saiyan that ran riot through the Southern Galaxy!
Paragus: The North Galaxy, and of course the Eastern and Western Galaxies, would be undivided under our rule, and an empire belonging to me and Broli would stand for eternity!
(No mention of the Southern Galaxy.)
It was said to be destroyed by Goku, and King Kai said at the rate he is going he is going to destroy his northern galaxy next. These are all from the sub btw. Plus the writer thinks he can destroy galaxies
Shigeyasu Yamauchi : When I had to work on the Broly movie, I realized that he lacked something, although he is the most powerful Saiyan. It's this solitude of the powerful warrior that I wanted to retranscribe. He can destroy galaxies but is alone compared to Goku, whom he despises but has a family, just like Vegeta. When he loses at the end, he realizes that strength is not just physical, he would have been able to unlock another kind of power if he had something to protect for example."