Yes and no.

In the US the Judicial branch is responsible for the the courts and interpretation of the law / constitution, but the Executive branch is responsible for the execution / enforcement of the law. I think that in other parts of the world it is common for the AG to be part of the Judicial branch, but here they are part of the Executive branch.

As I understand it, there are parts of these investigations/prosecutions that the AG can release under their own authority (or by direction of the President) but other parts that are under seal and require authorization from the courts.

I’m not sure that there needs to be a any grand cosmic reason for life to exist. Life could just be an accident of random events in our little corner of the universe.

Natural selection offers an explanation for how life changes across generations in response to challenges in the environment. It does not require a plan, just that the outcome of a chaotic process (reproduction) creates mutations that produce a slight edge, or at least no reduction in reproductive efficiency.