brotherhood_of_LAN - 9:40 pm on Jun 18, 2013 (gmt 0)
>Deleting compromised sites from the index is that solution
Indeed, but also discounting the link graph when it comes to them too.
My guess is Google's top priority is to serve a result when there is one to be served, they prefer to serve something over nothing.
Keeping track of all the hacks/bugs/compromises would be no small task.