Why do some people behave in such a rude way?

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Coach of ‘Team India’ Greg Chappell was on Monday attacked by an unidentified man at the Bhubaneshwar Airport when the team arrived there for its next match against West Indies in Cuttack on Jan 24. Chappell was reportedly hit on the back. Reports suggest that the unidentified attacker is an activist of Kalinga Sena. He apparently slapped the Indian coach in protest against the non-inclusion of some Orissa players in the team. The man was subsequently arrested. Chappell was hit when he, along with the team, arrived at the airport. Police is investigating the matter.