We may be their best market, but there are plenty of other markets for them all over the world that don’t have the potential to cause them as much harm as we potentially could. With the US removed or neutralized they wouldn’t hesitate to advance themselves into world superpower status immediately. I don’t think they will hesitate for one minute to try to take us out once they feel assured they could be successful.
last time i looked we were less than 20% around 17% or so.Important but not that much.