Hello, so, I just rescued all the animals at the Neverwinter Zoo, as a lawful good wizard.
This quest is a real conundrum for a lawful good character. I try to be lawful good in real life, as well as in the game. But I cannot stand animal cruelty. I certainly don't like poachers, either. I sometimes justify doing the quest by telling myself that I'm breaking up an unlawful poaching operation. Yet Nyatar tells you that the Blacklake nobles are turning a blind eye and allowing the zoo to exist. Does that make the zoo legal?
I wish you could get a ruling from Lord Nasher about it.
It seems like a lawful good character would want to work to change whatever law is allowing zoos with cruel conditions, or organize protests, or whatever, rather than attacking the zoo and murdering dozens of (innocent?) men. They do attack to kill on sight, though, once you're in the restricted area. But you are trespassing, which gives them the right, even in real life.
I have a similar problem with that woman in the town square trying to incite a riot, who asks you to murder Meldanen. I won't kill him, even though he's guilty of kidnapping a dryad and stealing a cure reagent. He attacks you on sight, and also has demonic imps around his estate, which makes him look pretty darn evil, but you're trespassing unlawfully on his property, so he has a right to attack you, and, you can't kill somebody just for being evil in the FR setting. Well, you can, but it's not a lawful good thing to do.
As soon as he sees you're stronger, he stops attacking and begs for his life. Killing a man begging for his life is an evil act in my book.
Lawful good alignment is really hard to play if you do it right, because game scenarios and also real life often put the "lawful" in conflict with the "good".