It'll become the norm to have negative feedbacks then, and it'll sort of nullify the effect of it.
If you're honest, then just go on ahead and do your business honestly and there shouldn't be a problem.
If you're an innocent person, than prove it. I am willing to prove, so I have no reason to be upset about a negative 20 rating, so please give me a downvote. I am ready to prove that I'm a good person.
Prove it by going around, doing your business. If people don't trust you to do an exchange with you, then use an escrow. (Unless you're doing some reversible payment exchange for bitcoins.) If anything, you should just completely disregard the little numbers under your username.
It is understandable that newcomers can't be trusted. You have all been worried, so why can't my proposal be taken into immediate consideration? I'm just trying to do what I believe in.
Because it does its job well of determining how the community thinks a user is trusted.
Let me put it this way: +0 is a NEUTRAL trust rating. It's like starting to count up/down from zero; you don't start counting from -20 and you don't start counting at +20. Zero is neutral, and so is +0.