That's easy enough to say for someone who probably hasn't done security before, nor worked in the intelligence field. And working with the benefit of hindsight to boot.
Shit gets routine really fast, and that stuff has never happened in those places before, ever. Where's the precedent for the kind of security required to spot car bombs and suppress automatic gun fire in that area?
The vast majority of the security screening they're relying on is at the borders, I'm pretty sure.
If you walked into any mall or walmart or marketplace or whathave you wherever you live, do you see anybody there prepared to face all that?
When you realize that any place where lots of people gather is a potential target, you also realize that there's no way to be able cover all of that with what few people there are proportionally in police and security services.
There's an phrase that they liked to toss around when I was deployed. "Everyone is a sensor." Everybody on patrol hears and sees different things. So it is imperative to ask everyone what they saw and what happened, afterwards. It is equally imperative that everyone talks about something that seems weird or off to them, no matter how small it seems.
And really, what needs to happen now is an awareness in everyone, especially civilians who probably never thought about it before, to be aware of what goes on around them. Things that might have been small and inconsequential before clearly have gained much more potential significance now.
Depending on how well planned these attacks are, there could be more in the near future. More likely though, there won't be because now everyone will be on their guard and too much activity will draw more suspicion than they will want.
Didn't they say that officials know who the culprits are? Chances are they were being watched, but as always, suspicion isn't proof and fewer things can be done pre-emptively and legally as a result. Which ends up leading to the whole ethical debates in the US about spying on people in search of terrorists in ways that weren't legal before. That's a messy subject that I won't touch on but you can start to see some of the logic and concerns that lead up to it.