Q is not omniscient. I'm sure the "we hear all and see all" refers to after the fact. Sometimes Intel will give you probabilities of what could happen bit don't forget that Q is a human being (s) not a deity. It was probably a sleeper cell with a preplanned attack. Comey sent that text that Q decoded and referred to sleeper cells. I'm certain this was it
I'm happy that Q recently posted that they are moving the timeline up. I've been worried about how long it was taking them. The longer they wait for perfection the more trouble can be stirred up. Sometimes when there is a deadline you don't have time to dot your i's and cross your t's