Over the years, endless discussions have taken place about similarities and differences between man and other animals, especially apes.What use is a comparison with our nearest relatives when it is clear that knowledge about animal behaviour is not directly transferable to behaviour of modern humans?
A comparison may open eyes and broaden one's outlook. At the very least the relevance of models and hypotheses derived from behavioural research on animals may be assessed in humans. Because of his evolutionary past, man is equipped with emotional predispositions which have contributed to succesful reproduction in the past.
Ethological methods (systematic, comparative and direct observation in natural surroundings), ethological questions (into biological functions) and hypotheses derived from ethological research may contribute to enhancing knowledge about human behaviour.
It is essential that these different types of contributions are not confused and that comparisons do not deteriorate into superficial extrapolations.
Systematic ethological observations seemed eminently suited to study to behaviour of people during potential riots. The groups that form are always temporary, most involvees from different parties (hooligans, demonstrators, police officers) do not know one another personally, a lot of communication is non-verbal. By observing a lot of situations, it was possible to make comparisons between situations that did and did not escalate. By directly recording observations, I did not have to depend on the memories of the people involved to gather information.
The parallel with my chimpanzee investigations was entirely in the method. No comparison or application of hypotheses was involved. That would have been weird, because violence during riots is performed mainly by young males during or after puberty, collectively and directed at targets from other groups. It is incomparable with the individualistic teasing of groupmembers by (male and female) chimpanzee pre-pubertal youngsters.
Nevertheless, many media suggested that I extrapolated my chimpanzee findings to football hooligans. The Wall Street Journal wondered why the Dutch government commissioned a study on hooliganism to an animal researcher and stated that I had reached the conclusion the football violence is nothing but the posturing of adolescents, similar to the behaviour of young chimpanzees. More publicity about "football apes" followed. Even more serious commentators wrote that "football fans have something animal, they act according to a primitive kind of honesty which makes them both repulsive and intriguing in more civilised eyes". Not only hooligans were put on the same line as chimpanzees. Some cartoons showed riot police with chimpanzee faces.