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If the whole human population spoke one language there would be mutual understanding enlightenment, and peace.
Many wars are caused by disagreements over ideology, politics, and many other issues which having a shared language would not affect.
Centrism should be the only logical political viewpoint of rational human beings
Centrism is not always the best position to take on issues. Take slavery as an example: abolition is an extreme position, yet its clear to most that it is the most moral and correct position.