Having the ability to give a +1 but not a -1 is like an every-kid-gets-a-ribbon kindergarten track meet. When someone says something really, really stupid they should receive feedback. Negative feedback. Think of it as an educational thing.
In some instances a -1 is a better tool for feedback than posting a response to a really, really stupid post. There are times when a comment is just so stupid that people don't want to respond so as not to direct the conversation in that direction.
I'm not suggesting that we get as many negs as we do +1s (ten per day). But rather, a lower limit of, say, two -1s per day might be appropriate.
What about it? Would I receive a -1 for this idea?