Think of a crowd of people, the bigger the crowd the more anonymity you have. Tor isnt all that great but its not bad as a concept or its implementation so long as large numbers of people use it.
Tails isnt that safe either if you want real safety use a more secure os not linux or if you like linux, checksum all the source read it, understand it, edit it, patch it, and compile it. a good secure lsb base system can be compiled in 2 or 3 hours.
I use encrypted ram, and tresor, selective stealthing on ports, and a whole lot of other goodies that would never see the light of a default setting on a linux distro. failing that i use z/os on the basis most people couldnt ipl a system if their life depended on it.