There is only one reason I can think of: Strategic reserve.
If US oil reserves are really as large as people say, that's a significant advantage if something like peak oil actually occurs. But I doubt anyone is thinking this way, but it'd be hard to know, as you can't really go around saying that.
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If US oil reserves are really as large as people say, that's a significant advantage if something like peak oil actually occurs. But I doubt anyone is thinking this way, but it'd be hard to know, as you can't really go around saying that.