Many years ago (around 1954 I think) Costa Rica decided it could do without an army. The army just kept causing trouble as it did in most Latin American nations,with or without the USA and its criminal CIA inciting that trouble. Since then, Costa Rica has done rather well as a country and is currently doing very well. Maybe it's time for one country to find a way of doing without spying agencies - or at least limiting things to what are basically police operations - finding out enough to stop crimes in their planning stage. In the case of both 9 / 11 USA and 7 / 7 in the UK, a more focussed, less megalomaniac, intelligence agency would probably have pieced together the information which was in fact available to it.
One final thing. It's often said that governments who rely on reports from their diplomats to know what is happening in a particular country would do better to read a good newspaper. The same is true of intelligence reports. Macintyre doesn't really probe it, but it is often unclear whether people in MI5 or MI6 had much grasp of geography or history or current affairs. But there are hints. For example, both American and British intelligence agencies have placed great reliance on emigrés with fairly disastrous results. They have failed to see that emigrés are not always honourable people forced into exile by unpleasant regimes. Some of them are crooks who used regime change as a chance to escape their country and present a new image to the world. Others are bitter and resentful at the loss of power they never deserved to hold. Some simply become absurdly nationalistic to compensate for their loss of a homeland. In all cases, emigrés should be treated with caution. But no one does that and so we still suffer from the Curse of Miami Cubans.