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Conversely, we seem to generate a laugh when talking about routing (like shooting) which apparently has some scurrilous associations in North America

Really, it just sounds silly. There are two homonyms, both spelled "rooting", one which means to support by encouragement, as in a sports team, and the other means to dig around in search of something, like a pig might be rooting for a truffle.
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Bitt Faulk