I completely agree with your sentiments. But just to play devil's advocate, it is possible the authorities could have prevented the Bataclan massacre but chose

I completely agree with your sentiments. But just to play devil's advocate, it is possible the authorities could have prevented the Bataclan massacre but chose not to "for the greater good". There's a similar conspiracy theory around the Coventry blitz[0]. It might very well be false, I'm just suggesting there may be an alternate explanation (i.e. the French surveillance is actually working very well). [0] http://www.bbc.co.uk/news/uk-11486219 http://www.bbc.co.uk/news/uk-11486219