Talking out of my ass here, but I'd assume the problem is one of resources. While unemployment may be high, demand for "smart" people (which you'd need to work

Talking out of my ass here, but I'd assume the problem is one of resources. While unemployment may be high, demand for "smart" people (which you'd need to work on anti-human threats) is way to high. Combine that with technological feasibility, and the resources could probably have been spent elsewhere better. Today though, the technology is probably "common" (relatively speaking) enough to spend some resources on the problem.