Your trust in humanity is admirable if you think that everyone is emotionally capable of telling the two apart ;-)
Also, the problem is that upvoting is accepted as an expression of agreement. So it's a bit counter intuitive to reject downvoting as a form of disagreement.
I for one have decided to never downvote under any circumstances. Downvoting can be unnecessarily humiliating, even thuggish when posts become almost invisible. Using words should do the trick, even in cases of really bad behavior.
