I assumed you thought I was saying the French government had prior knowledge of the attacks and let them happen, and hence my calling that accusation moronic. ISIS are the most watched terror group on the planet at the moment, it seems far fetched they let something of this magnitude slip through the cracks.
It's not far fetched considering it was a handful of people in a country with a muslim population of about 5 million, and your intelligence office of less than a 100 people is trying to watch over 5000 people of interest in relation to any sort of radical Islamic organizations.
It's only far fetched if you think government intelligence agencies are completely omniscient. Or the more likely possibility of an extremely small group of people communicating with contacts, possibly outside the country, hiding in a huge population of innocent civilians were able to cause a huge loss of life.
Just think about it, they can't violate or even have the manpower and resources to keep tabs on the thousands of people in the country listed as being possibly connected to Daash, Al-Queada, the Taliban, or radical Islam. Any of them. They slipped through the cracks because no matter what a government does short of martial law, there's going to be cracks. That's exactly what loosely formed terrorist organizations that don't have the equipment or training to fight an actual first world military force are best at. They don't do anything to draw attention to themselves until the moment they all decide to attack.
