i definitely agree with the "zombie" part, but you have to admit there has been a large number of psychotic outbreaks in recent months. some of them without violent, or mental history that would indicate these violent outbursts.
and if you read what the Miami cannibal's girlfriend, mother, and friends said about him, you might question it too. They all said that he was a nonviolent person, very religious and always carrying a bible with him. They also said he was not a drug user, besides smoking pot which he was trying to quit. even if he did try bathsalts for some reason that day, it would take a huge amount to make someone commit that atrocity.
but odds are, someone drugged him. kinda weird we don't know for sure yet tho.
and reiterating that i definitely don't believe it's zombies. but i'm not ruling out that something may be causing theses psychotic violent outbursts.