how do you know what steps have been taken, or failed to have been taken?
Ah, good question, and an easy one, using simple logic.
We know that Epstein trafficked children to be raped by.......not nobody. Those kids weren't trafficked to nobody. They were trafficked to someone. And yet, nobody has been arrested for raping children. So it seems obvious, then, that a proper investigation hasn't been taken place, until we see a person/people arrested for raping children.
Unless, that is, you're telling me that the DOJ conducted a good, thorough investigation, and couldn't find probable cause to arrest a single person for raping children.