I have a strong feeling that many people consider life as a zero-sum game, i.e. they always assume that you'll benefit, if you harm/disadvantage someone. Any research on this?
This kind of thinking can be connected simply with psychoticism, which is classed as personality trait by Eysenck (1976). One pole of this trait is connected with altriusm and pro-social behaviours and the second one with psychopathy, schizofrenic and criminality behaviours.
1) Eysenck, H. J (1976) Psychoticism as a dimension of personality
2) Erik Woody†,* andGordon Claridge (2011) Psychoticism and thinking