This was the common belief at this time "research such as Lorenz" (1974 cited in Brown 2007) put forward a biological theory arguing that conflict could be explained in terms of intrinsic aggressive instincts Tajfel believed that this 'blood and guts' model as he coined them did not account for the waxing and waning of political conflicts throughout the world. ... Motivational premises are not entirely excluded as individuals are motivated by the need to make sense and have a positive self image. ...

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