Tor Hidden Services

I have been running TOR relay for some time already but just recently discovered the world of TOR hidden services and I was kind of shocked. There is services like BlackMarket and Silk Road where drugs and guns and whatever is sold (and paid with anonymous, untrackable Bitcoins). Also child porn and other sick and illegal material is easily available. I am advocate of privacy and anonymous web use but this is something I was not hoping to see. For sure authorities will intervene at some point and actually I wonder why they have not done that already. Is it so that they don't have technical means to interfere or what? In the mean time there is wild west going on in the dark underground of the internet and it is quite exciting I must admit.