I am against removing either parts of the rep system or in its entirety.
I like letting people know when I genuinely like their posts, find it funny, or very interesting. I don't particularly like but am still fine with the value of the negative repping system. It allows users to send a message stating their obvious dislike of a certain message. The user who was neg-repped then has the ability to either use this information as constructive feedback and learn and grow from their ways, or become enflamed at the situation and respond in like.
Why are we even considering it's removal? Are we so immature that we can't even control our own actions? If somebody you hated was walking in a dark alleyway, would you go and stab them knowing full well you won't get caught? Probably not if your base emotive substance is for living a life of positivity. Probably yes if you just don't care or you have absolutely no control over your emotions.