Information overload. Big Data = big pile o' garbage. In the States, many overlapping intelligence agencies. Given the volume of data the NSA and GCHQ must be swallowing up, it's easier to collect it all and investigate an incident retroactively than stop an attack. These agencies would be in the market for a good AI. In the meantime, they will continue to swallow up everything they can like the vampire squids they are and whine about increased use of encryption while pouring millions into quantum computing research in order to break it.