Psychology says people who try to get in an elevator or metro first and not let others disembark aren't always trying to be rude or cause trouble. In crowded public spaces, people can become focused on their own needs. They may worry about missing a train, finding a place inside or reaching a destination on time. This pressure can affect how they notice people around them. Their attention can become limited to the immediate goal. As a result, they may enter before allowing passengers to leave. Psychology connects this behaviour with egocentric bias, anxiety, cognitive overload, de-individuation and a scarcity mindset. These factors can affect social cooperation.