Context
I'm new here and giving this a try since the Neuroscience SE proposal has been shut down. For some reason I seemed to have pissed someone off. There was a bad answer in a question about Dopamine and maybe I was too mean to the person, the answer has since disappeared. I went an checked out some of the user's questions to get a feel for the way he exposes his ideas and down-voted a couple of one liner questions that seemed not well thought out. I forget the user's handle but I know his/hers rep is in the thousands. Today I found all of my contributions down-voted, as a result of what I can imagine is some retaliation. I don't care about the points.
Question
In any case this got me thinking if there is any safeguard in place to discourage personal attacks like indiscriminately down-voting all of a particular user's contributions?
I know that down-voting answers costs 1 point to the down-voter and 2 points to the down-voted, and also know there is a limit of votes per day. The relationship between up-votes and down-votes also seems appropriate as one good answer "deletes" 5 down-votes. However, if I get two or three friends with rep to spare can hypothetical me down-vote a target into oblivion?
Should there be a counter that limits down-votes to a particular user, so if user-A just down-voted more that X% of user-B's contribution user-A looses down-vote privileges to that user for some time?