Oh, and they just happened to travel to Yemen to get training all on their own?
They just happened to have had contact with terrorist groups in Yemen because they bumped into them somehow one one?
They just happened to wake up one day and find a way to get hold of automatic weapons in a country like France where guns are outlawed?
One of the brothers just happened to wake up one day and decide that the life he was living of trying to become a rap star and having girlfriend's, etc, was suddenly wrong and the only way that he could make up for his sins was to attack a magazine for something they printed years earlier and then die as a martyr.
They did all that on their own with no on behind the scenes encouraging them, brainwashing them, training them, supply them weapons, etc..
Thanks I think I understand you