Well, I like to think that Nico has some good arguments for her keeping slaves. All in all, I tried to go a middle way with her between pro-slavery and contra-slavery. Reforms to the system? Yes, most certainly. Abolishing it? What the hell are you thinking?
Still, I left EVE. Which had several reasons:
1. SW:TOR - Quite honestly, I had neither time nor money to keep up the EVE account as well.
2. People running around presenting Amarr as "Space-Catholics".
3. People running around presenting Amarr as "Space-Nazis".
Especially the latter two are time and again immersion-breaking for me.
This starts with the "is that what the priest said when they raped you?" Lou mentioned and ends with people citing the Bible as Amarrian Scripture and people simply assuming that the Amarrian concept of God is just the same as catholic doctrine dictates (The three A's). Something experienced coming from both sides of the Amarr/Minmatar divide.
It's roughly the same with the "Space-Nazi" or the "Sansha=Borg" thing, though it's oftentimes more subtle. The fact that there are similarities doesn't mean they are the same or make the comparison any less ridiculous. I imagine Caldari get to hear that too, since Heth.
For me, it's not just a thing of "race to the bottom", dullness nonsense and resulting boredom. The immersion isn't broken because I'm bereft of meaningful replies to "is that what the priest said when they raped you?", but mainly, because I'm immediately pulled out of character and think to myself something like: "If you have quarrels with that, go argue with a catholic priest."
Religion, freedom, slavery, racism, Democracy vs Dictatorship are topics that are hot. All of them touch the Amarr to some degree. That what makes them so interesting. On the other hand, though, it really gets dull when people push those debates pertaining to these topics on you, which they should rather have with the people in RL they aim at.
P.S.: As far as I can tell "all those slavers", that are "gone", are IC'ly either minding their planetside business or went to Angels / turned to Sani Sabik-ism.