I can sympathize with them, when you're dealing with botnets and distributed enterprises and such, it can be hard to conduct an effective criminal investigation. But I don't know that giving them carte blanch to go on a hacking rampage is the solution.
http://www.computerworld.com/s/article/9248242/DOJ_seeks_new_authority_to_hack_and_search_remote_computers
http://www.computerworld.com/s/article/9248242/DOJ_seeks_new_authority_to_hack_and_search_remote_computers