 Behaviors such as thrill seeking and aggression are viewed as actions which stem from this Thanatos instinct.However, some scientists argue that there is little evidence that most people have a specific drive toward self-destruction.According to them, the behaviors Freud studied can be explained by simpler, known processes, such as salience biases (e.g., a person abuses drugs because the promise of immediate pleasure is more compelling than the intellectual knowledge of harm sometime in the future) and risk calculations (e.g., a person drives recklessly or plays dangerous sports because the increases in status and reproductive success outweigh the risk of injury or death).