I knew this was a user made quote. More should follow outcasted, if you mean what I think you mean, not precede it. They tend to be outcasted more (often). Putting it in front reads like outcasted to a greater quantity of outcastedness. Also it seems as though you are saying that the same people are both treated worse and treat people worse, that seems a bit unlikely, not everyone can be an outcast, there has to be a group from which to be cast out.

"outcasted" is not a word

Original quote was L think, now changed