Actually it's not a bad idea, the trouble is spotting the starting gun. The start point is easy to spot in hindsight, but very hard to notice at the time.
For example of how hard it is to spot the start point:
Are we going to need to fight the US in ten years? The trajectory they are on right now is one ending with a theocracy ruled by a clique of rich types, which are known to act in a manner resembling a loose cannon, not based on logical thought and happy to ignore international laws and opinion (sort of a cross between Iran and Russia, with a massive budget).
Or is it just history congealing?