They have nothing better to do. I mean that seriously.

We're generally safe, but all the security organizations need to do something to justify themselves, and have ways of thinking that always pursues "greater security" as a direction even if it overshoots what is reasonable for free people.

When security begins to impede freedom, the mandate of security must be placed below the mandate for freedom. Security is there to protect freedom as its ideological basis, so this is an obvious prioritization.