I hate to use this defense of people, but I'm going to use it anyway. There are bad apples in any profession, and for certain professions it's going to be a lot easier to see. Ex: You're going to know when the people in law enforcement are bad people, because they're typically being recorded or something along those lines.
But to go onto the articles that you've linked. The Apple discrimination one I think is bullshit. I think that what happened is that one person put in their joint income - his and his wife -- while his wife only put in her solo income. Maybe there's some debt we don't know about, occupation changes, etc. Credit is a very interesting place, though I wouldn't think Goldman Sachs would willingly and openly go and discriminate like this -- doesn't really make sense and seems to have no net gain.
Just bad PR.