The difference between a real debate and a debate contest is that in the former, both sides of the debate stand on their own true positions, while in the latter, the role is determined by lot. What is the view that the above paragraph mainly supports? ['The real debate is to maintain opinion, and the competition is to improve skills.', 'The two sides of the debate are decided by lot.', 'The purpose of real debate is to uphold social norms.', 'In a debate contest, both parties must uphold their personal views.']