In a word: because of fundamental attribution error.  Wikipedia describes FAE as: “the tendency to over-value dispositional or personality-based explanations for the observed behaviors of others while under-valuing situational explanations for those behaviors.” What does that look like in practice?  Like this: Tim taps his foot impatiently, looking around the meeting room.  “I’d like to get started because we have a lot to cover,” he says, “but as usual Mary is late.”  “I think she was finishing up the interim report,” Greg tells him.  “She ought to be here any minute.” “She’s always finishing up something,” Tim snaps.  “She just doesn’t seem to place the same importance on being on time that the rest of us do.” What the FAE says is that we tend to see the actions of others as driven by their intentions, motivations or personalities, rather than by the situation they perceive themselves to be in.  But…