In fiction writing, I would say there are several different strands that have been woven through my own writing, and each influenced by a different group of writers.
You shouldn't go around the world behaving ruthlessly when you don't have to. Sometimes you do have to. There is only so much pie to go around. If you're going to take more than your fair share of pie, as socialists would look at it, then someone else is not getting his. That means you've got to take it away from them.