Be mad at Putin. He’s the one who ignored the terror warnings.
How do you know he ignored the warnings?
Can you verify that other planned attack(s) were not thwarted? We have no idea what was, or wasn't, done behind the scenes over there.
As they say, state governments have to be right 100% of the time, while the jihadis only need to be lucky occasionally to cause chaos and damage.
Maybe so. But what does that have to do with my post?