Agreed. If it happens, which it may not, the burning of France will serve as an abject wake up call to the others, and some among ourselves.
Another lesson to be learned, is that trying to hide behind political neutrality offers as much protection from a dedicated invasion as did the Maginot Line.
There is no such thing as a long term sustainable defense. Never has existed. Does not now exist. Never will exist. Attack the threat or be attacked by the threat. Those are the options.