Birch, you all know we're on your side here!
When there is visible abuse, and known past abuse, then I do not see how it is bad.
I'm going to use a gaming-refrence here, because I feel it applies to real life. There are different kinds of "alignments" in a game.
Chaotic-good - you're going to do whatever you feel like is the best desicion, no matter rules or laws. The greater good is more important to you; so you'll free slaves even if the local law says slavery is legal.
Lawful-good - you'll follow the rules no matter what they are; with the intent of using these rules for the greater good. But if slavery is the law, you won't free a slave (out-rightly). You'll go through the books to get the slave freed legally.
there is also lawful-evil and chaotic-evil. Some pro-lifers remind me of lawful-evil. They're following the rules, sure... but they bend them for their own dastardly plans. They're even happy when evil laws come into play, becuse that makes it even easier. Evil here is very clear: the restriction of human rights, the discrimination against groups of people, and the increased control of the evil ruler(s).