As sad as it is, I think the responses will be: - we need more surveillance rights and money for the secret services - we need more police and higher spending - and possibly bomb some country (Syria is en vogue) What won't be said is: - How come this happens again without anyone having seen it coming? - What does it say about the success of the Western anti-terror foreign policy adopted ~2001?
For every attack that they "didn't see coming" there are, most likely, plenty of attacks that they "did see coming" and stopped. Even more likely is that we don't hear about these stopped attacks because they aren't sexy news. Or, when attacks ARE stopped, and it's published, people question whether it's just blustering by the government to justify their jobs. It's not like you can say "yeah, we saw that coming and l…
The problem with this argument is that it can be used to justify any security measures, no matter how costly or stupid. Because maybe it's really very effective in practice but we can't tell you about it?
You're basically saying "trust us, we're the government." It's the recipe for total unaccountability.
So no, they have to justify that the costly and stupid security measures actually work. Or we'll have nothing but costly and stupid security measures that don't actually work.