The initial funding, development, and implementation for the TOR project was provide by United States Naval Research Laboratory and DARPA. So you can blame them for letting the dark web out onto the internet with all the clandestine behaviour that that resulted in.
It has taken the CIA and FBI years to get to the point where they can detect traffic and end points; and they were complaining, along with the governments of this world about the use of TOR and the little known I2P.