The point is probably more that you are never really thinking about those things. They are presented for a shock effect and then they are gone and never mentioned again.
To be fair, the sex only happens once in the game so far, as well. :P
Not everything on that list is a one-time occurrence, though. Well - Abdirak is definitely just there for kinky shock value. But the Tiefling refugees are pretty traumatised about their experiences, and you hear several different NPCs' perspectives. So you do pause to think about their stories as they're presented several times. Racism is mentioned or implied in various conversations, especially if you are a Drow or a Tiefling. Astarion's 200 years of slavery have clearly left their mark on him - figuratively and literally. There is no way to have a happy ending for Mayrina's story, and she implies she is going to Baldur's Gate so you may encounter her there again. In fact several NPCs mention this, so we aren't seeing the last of many of them. I'm sure the more the game keeps going, the more messed up and dramatic the issues and resulting choices will become.
