Did Abbadon know better? (LWS3 spoilers)
Balthazar is not trying to release magic into Tyria. He is trying to steal magic for himself. Huge difference.
Truthfully given what we know now, Abaddon was in the wrong because releasing magic into the world would have woken the Elder Dragons sooner. However, something you seem to miss is that all the gods were releasing magic into the world – Abaddon had just given the largest amount, which sparked wars. Abaddon’s rebellion wasn’t solely because of the amount of magic in the world, but also due to the actions of the Margonites and Forgotten:
The Margonites, then a human nation, had held Abaddon as their patron god and defaced statues of the other gods in the famous Temple of the Six along the Crystal Sea’s edge. Because of this, the Forgotten waged war with the Margonites, nearly wiping them out. Abaddon saved them and wiped out a bunch of Forgotten, and this drew the gods’ attention. Abaddon is also credit with wanting to have ruled the world, exiling or killing the other gods to do so, and waged war on the Gates of Heaven.
It wasn’t only about magic, that was just one of the many things that built up to the war and rebellion.
Also, what Balthazar is doing now is clearly being shown as not good for Tyria, so just because he’s now doing something “similar” (though not really) as Abaddon doesn’t mean Abaddon might’ve been in the right – it rather means Balthazar is now in the wrong, where he was in the right before.
Stop treating GW2 as a single story. Each Season and expansion should be their own story.