This is an honest to god problem. The game is a passive mental trainer for the acceptability of slavery as a practice, and enables players to live out the fantasy of slave trading if they choose to do so without any respect or recognition of the human cost
No. This is your problem.
The game, with emphasis on
game, is putting the player in a dystopian society and is confronting him with some evils, maybe with not exactly the best implementation ever, but that's not exactly the point.
It's your choice how to deal with evil. If you want to engage in a life of crime, you can. If you want to fight crime, you can . It you want to play a saint, you can do that too.
For example, I never got involved in slave trading of any type and i usually play a good natured character living on the right side of the law
As a result, i might get a fine here and there for grazing a ship or for some contraband, but i don't do terrorism (massacre civilians and other wetwork missions with similar outcome), i refrain from murdering clean ships and generally speaking from any activities that would incur bounties.
I do get involved in wars and in massacre pirates missions, so i do murders, but they're sanctioned murders within the game context and i can live with that.
However the game does not force anyone into any evil type of activity - you can play the game (with some limitations) without firing a single shot.
You can play the game totally severing your ties with the human civilization - the starter sidewinder is good enough - just fit some A rated FSD and head towards the center of the galaxy - there are hundreds of billions of stars waiting to be discovered and you can do that the very moment you leave the starting systems.
What i find disturbing is that your moral compass seem to be very erect when it comes to slavery, but it starts to bend when it comes about murder - which for me is the ultimate evil since it's... well... definitive
Players can only marginally involve in slavery and cannot be slave owners.
On the other side players can get directly involved in missions to massacre innocent civilians for the purpose of spreading terror.
AkA Terrorism. And this does not seem to bother you.
But yes, diversity - and i'm ok with this. You are bothered by slavery, i am bothered by terrorism and i read that others were bothered by animal meat.
Just don't ask for game changes to suit your sensibilities pretty much the same way i dont ask FD to remove terrorism (and crime generally speaking) to transform ED universe into a pastoral universe.
It's a cutthroat galaxy out there, definitely not a pastoral idyllic one.
If you cannot really cope with it, it is better to find some other game to play, but let ED be ED and not Friendship is Magic