- selfishness
- doing things allegedly altruistically, when you're only doing it to feel good/show off to others
- discussions that will get nobody nowhere
- people who think they know everything but know not even themselves
- prejudice
- fear of the unknown
- hard-headedness
- 90% of the world population being straight... it should be half-half
- religion
- george w bush
- conservative parties
- competition (not rivalry)