That's kind of interesting when you consider that Peter's primary ability is empathic. It's how and why he's able to mimic people's powers.
The writers seem to have lost that notion about Peter. If he was empathic towards Sylar, he wouldn't have snapped his neck. Having the hunger himself, he should be the first person to realize that Sylar wasn't really guilty of his crimes, or at least not in the way Peter would have earlier assumed. I think Peter's empathy fell into a plot hole (maybe there's a Plot Hole man running around this story like Vortex guy who's to blame for it all
