Nah ... only scary if you haven't got a clue what you are doing. Zeronet is p2p in terms of distribution, meaning you have what everybody else has, just like the movie you downloaded the other day with bittorrent or something. If you do not delete the file from the list, you are still seeding/ hosting it for the network. Differently from a movie, usually just an mkv/mp4 + some text files, you are seeding all content uploaded by others. Note the list second from the bottom: My little pony? Any unsavory content that goes with it, is now on your computer. Forensic: oh ... lookie here: we found childporn on your computer. And you are a distributor. Oeps!  Hence: bleachbit. Remember those 30.000 Hillaryous emails? So, deleting it would then be best. The file itself gets overwritten with ones and zero's. But depending on what system you have, you may want to check other places where logs and stuff may be stored that point towards what you had. On a general note: the use of bleachbit to maintain your system should be a regular act, just to make sure you remain in the green.