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I think it's the 'necessary' that's causing the problem. Which side of the road your culture chooses to drive on is arbitrary; there's no particular reason for picking one or the other as evidenced by the fact that many countries use each side. However, it's not necessary to drive on the left, or necessary to drive on the right - it's necessary that a choice is made, which I think is what KnifeMissile may be after.
In short, the choice isn't necessary (the result of the choice) - but it's necessary that a choice is made (or we'd all hit each other, as Mr Mephisto points out).
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I can't understand why people are frightened of new ideas. I'm frightened of the old ones. -- John Cage (1912 - 1992)
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