Another good way to reduce this problem is to just get rid of the down vote....
if a post is worth the down vote than that person's post is worth no comment at all
so Rather than down~vote ...

~just give nasty blog posts no comment at all~

People that consistently don't get votes will simply give up and leave the Network...
And if you think that a post has been unfairly down~voted then by all means give that posting an up vote and counterbalance the negative vote.
let's just get rid of the download all together what's say you?