I just assumed the AI pilots are all of Canadian descent... if you've ever driven in Canada you know its one of the more terrifying experiences known to man.
Or Mauritian, I was told whilst I was on holiday by a taxi driver that the French on the Island always felt the driving should be on the right, the English thought it was on the left. So the Taxi drivers didn't want to disappoint anyone and driver down the middle, probably the same reason in Canada.