To me, something feels wrong about disabling the neg rep system. I mean, we're not babies... If we're gonna poop ourselves over a red square in our User CP, then maybe it's time for a reevaluation of our lives.
In a previous life, I received two neg reps (one was grey (not enough rep power!) and the other was as an experiment). At first, the red one felt like a violation. I was pissed that someone would have the audacity to smear that crap in my personal space. However, I soon realized that it's really not a big deal and life goes on. There's a lot of unfair BS in life, like being born into hunger or having your house destroyed by a natural disaster. Neg reps seem so mundane in light of those kinds of things.
It's a personal development forum. Neg rep has it's place, I say.