You wont get neg repped as long as you dont break the rules, continuously and repeatedly.
Each decision is discussed, evidence of the offending post, of other mediums of conciliation, and a thorough investigation as to past deeds.
Additionally, mods are not shrouded behind a veil, and are accountable for their actions.
We are being moderated, by those higher than us, and if you feel an injustice has been done, im sure people would be willing to hear your argument out. But like i said, it is a last ditch thing, rather than a close thread reaction.
Be aware that we are just as accountable for our actions as you are, even more so in most cases.