Re: Two issues here.
"They are supposed to be "in charge" No, they aren't. They are supposed to serving their constituencies, the people who voted them into office, and those that unsuccessfully voted against them too.
"Since there is nothing practical they can do, they invent plausible stuff instead." If it has been invented (in this context), it isn't plausible. It sounds plausible, and may even make a weird kind of sense, but regardless of their intent, it isn't plausible.
I have serious concerns about the Security Services calls for the insertion of a "Back Door" into security software, so that they can gain access to messages between terrorists. Completely illogical, because it will be broken into, sooner or later. Besides, what terrorist is going to use security software that has a government back door?