Therefore,
"Multiple-Ignored-warning Lone-wolf terrorist attacks",
they are.
For the benefit of the rest of us, “known wolves” should be required to (metaphorically) wear a bell around their neck.
The authorities know who to “watch” but out of fear of being called racist/islamaphobic they fail to act.
Have you seen this LifeLock TV Commercial of the uniformed bank security officer who says "I'm not a security guard, I'm a security monitor"?
https://www.ispot.tv/ad/Ant5/lifelock-fix-it
That's our Homeland Security Department and our miulti-billion dollar security agencies.
For the most part they seem to function as not much more than security monitors - collecting and collating data about terrorists and potential evil-doers.
But at least where muslim terrorists are concerned they don't seem to act on it before the terrorists get out there and murder more innocent Americans.
And after almost every muslim terrorist act we find out that the perps were known to our security agencies but no action was taken until it was time to bring in the locals to draw chalk outlines around the bodies of their victims.
Yet the feds sure do seem to act quickly and decisively when the person of interest is a conservative gun owner with a complaint against the federal government or a dirt farmer who dug a drainage ditch on his property without an EPA permit.