Both of these attacks were a complete surprise and none of the attackers - though known to authorities - have been shown to belong to an organized cell under central or even hierarchical command. Hence they've been called by many "lone wolf attacks".
Rather than reveal the decentralized and spontaneous nature of the enemy's strategy, these attacks may very well reveal that the enemy now has cells across the globe that can avoid detection and that they have found ways to communicate, train and command terrorists without detection.
I suspect that Obama's systematic dismantling of our clandestine defense apparatus is why.
This won't be repaired until we no longer have islamo-appeasers in the OVAL OFFICE and heading the CIA.
And even then, it will take months to fix. So between now and 2017, I expect several attacks here in the USA like the ones in Paris and Copenhagen, and even a mega-attack.
The enemy knows this. And Obama either couldn't care less, or is smiling inside.